A sample of sodium percarbonate (Na2CO3*nH2O2) weighing 0.024g is diluted using a 0.10 M solution of...
A sample of sodium percarbonate (Na2CO3*nH2O2) weighing 0.024g is diluted using a 0.10 M solution of sodium thiosulfate (Na2S2O3). The volume of sodium thiosulfate used is 4.25mL. There are 3 questions:
1. What is the amount of hydrogen peroxide in the sample in moles?
2. What is the amount of sodium carbonate in the sample in moles?
3. What is the molar ratio of H2O2:Na2CO3?
So far, I've found that there are 0.000425 mol Na2S2O3 ; however, I'm unsure how to back out the amount of hydrogen peroxide and sodium carbonate?
Homework Answers
the chemical formula of sodium percarbonate is 2Na2CO3.3H2O2. 2 moles of Sodium carbonate crystallise with 3 moles hydrogen peroxide forming an adduct.
the molecular weight of the adduct is 2*[2*22.99 + 12.011 + 3*15.999] + 3*[2*1.008 + 2*15.999] = 211.976 + 102.042 = 314.396 gm/mole.
1. Fraction of H2O2 in the adduct = 102.042/314.396 = 0.3258
Amount of H2O2 present in 0.024gm of the adduct = 0.3258*0.024 = 0.0078 gm
Molecular weight of H2O2 is [2*1.008 + 2*15.99] = 34.014 gm/mole
No. of moles of H2O2 present in the provided sample = 0.0078/34.014 = 2.29*10-4 moles
2. Fraction of Na2CO3 in the adduct = 211.976/314.396 = 0.6742
Amount of Na2CO3 present in 0.024gm of the adduct = 0.6742*0.024 = 0.0162 gm
Molecular weight of Na2CO3 is [2*22.99 + 12.011 +3*15.999] = 105.988 gm/mole
No. of moles of Na2CO3 present in the provided sample = 0.0162/105.988 = 1.53*10-4 moles
3. Molar ratio of H2O2:Na2CO3 = 2.29*10-4/1.53*10-4 = 1.5496
Add Answer to:
A sample of sodium percarbonate
(Na2CO3*nH2O2) weighing
0.024g is diluted using a 0.10 M solution of...
A 3.9 g sample of sodium hydrogen carbonate is added to a solution of acid weighing...
A 3.9 g sample of sodium hydrogen carbonate is added to a
solution of acid weighing 10.4 . The two substances react,
releasing carbon dioxide gas to the atmosphere. After the reaction,
the contents of the reaction vessel weigh What is the mass of
carbon dioxide released during the reaction?
A 3.9 g sample of sodium hydrogen carbonate is added to a solution of acetic acid weighing 10.4 g. The two substances react, releasing carbon dioxide gas to the atmosphere....
Sodium carbonate, Na2CO3, reacts with hydrochloric acid, HCl, to produce sodium chloride, carbon dioxide and water....
Sodium carbonate, Na2CO3, reacts with hydrochloric acid, HCl, to produce sodium chloride, carbon dioxide and water. Refer to slide 7.18 for a summary of formulae relevant to the calculations below. 2HCl(aq) + Na.CO3(aq) + NaCl(aq) + H2O(l) + CO2(g) 1. Use this reaction to explain what is meant by the terms "acid", "conjugate base" and "salt" 2. Balance the equation for this reaction. 3. A solution was prepared by dissolving 5.00 g of Na2CO3 in water and adding water to...
I tried doing the first few but I'm not sure if I'm doing right and I...
I tried doing the first few but I'm not sure if I'm doing
right and I need help with the last few. the last picture is the
equation page. thank you!
Nov 23, 2015 Experiment 5 Advance Study Assignment: Identification of a Compound by Mass Relationships 1. A student attempted to identify an unknown compound by the method used in this experiment. She found that when she heated a sample weighing 0.5032 g, the mass dropped to 0.2663 g. When...
The Na,Co, solution described above was used to analyse a hydrochloric acid solution of unknown concentration....
The Na,Co, solution described above was used to analyse a hydrochloric acid solution of unknown concentration. It was found that 24.30 mL of the Na,Co, solution was required to neutralise a 20.00 mL sample of the hydrochloric acid solution. 4. Using your answer to part 3 above, calculate the amount of Na,Co, present in 24.30 mL of the Na,Co, solution. (2 marks) 5. Using your answer to part 2 above, deduce the amount of HCl that was present in the...
Johnny wished to create a 0.300 M NaCl solution. Johnny only had 50.0 mL of water,...
Johnny wished to create a 0.300 M NaCl solution. Johnny only had 50.0 mL of water, however. To create his goal solution, Johnny knew he needed to know the molar mass of NaCl, which was [Select ] Next, to find the the number of moles of Naci he needed, Johnny simply multiplied the [Select] by the volume of water, in liters, which was [Select) L. Then, he calculated the number of grams of NaCl he needed taking this number of...
1) One hundred (100) ml of a 1.00 M solution of HCl is diluted with water...
1) One hundred (100) ml of a 1.00 M solution of HCl is diluted with water to prepare a 0.200 M solution. What is the volume of the resulting 0.200 M solution? Or asked another way, to what volume must the original solution be diluted? (3 points) 2) Lithium hydroxide, LiOH, is used in spacecraft to absorb the carbon dioxide exhaled by astronauts. Given 1.3 kg of LiOH, how many kg of CO2 can be absorbed? (10 Pts. The reaction...
8-15 8. If S0.0 mL. of a 0.10 M solution of sodium chloride is mixed with...
8-15
8. If S0.0 mL. of a 0.10 M solution of sodium chloride is mixed with 50.0 mL of 0.10 M magnesium chloride, what is the molar concentration of chloride in the resulting solution? a. 0.10M b. 0.20 M c. 0.05 M d. 0.15 M e. 0.25 M 9. What would be the products in the ionic equation for the following reaction? 2HBr(aq) + 2KOH(aq) → products 1. KTaq) and Br(aq); tl. KH(aq); III. H,0(1); IV KBr(s); V. BORI(aq); VI....
I need it right now, please help me?? PROCEDURE PART I: DILUTING THE VINEGAR SOLUTION The...
I
need it right now, please help me??
PROCEDURE PART I: DILUTING THE VINEGAR SOLUTION The vinegar solution must be diluted by a factor of 5 to be suitable for titration. 1. Obtain - 20 ml of the stock vinegar solution from the fume hood. 2. Using the 10-ml. pipet, pipet" 10 mL of the stock solution to a 50-ml volumetric flask. 3. Fill the volumetric flask to the calibration line with distilled water. Be sure not to go over...
The following primary standards can be used for the standardization of bases except. a. Benzoic acid...
The following primary standards can be used for the standardization of bases except. a. Benzoic acid b. Oxalic acid c. CaCO3 d. KHP A solution that may contain NaOH, Na 2CO3, and NaHCO3, alone or in compatible combination was titrated with 0.1200 M HCl. The volume of the acid required to reach the phenolphthalein endpoint was 25.67 mL while 38.13 mL to reach the methyl red endpoint. What are the components of the mixture? a. Na2CO3 only b. NaOH only...
3.355 M K2SO4 solution can be prepared by A) dilution of 500.0 mL of 1.00 MK2SO4...
3.355 M K2SO4 solution can be prepared by A) dilution of 500.0 mL of 1.00 MK2SO4 to 1.00 L B) dissolving 46.7 g of K2SO4 in water and diluting to 500.0 ml, then diluting 25.0 ml of this solution to a total volume of 500.0 mL C) dissolving 46.7 g of K2SO4 in water and diluting to a total volume of 250.0 mL D) dilution of 1.00 mL of 0.355 M K2SO4 to 1.00 L E) diluting 46.7 mL of...
A 3.9 g sample of sodium hydrogen carbonate is added to a
solution of acid weighing 10.4 . The two substances react,
releasing carbon dioxide gas to the atmosphere. After the reaction,
the contents of the reaction vessel weigh What is the mass of
carbon dioxide released during the reaction?
A 3.9 g sample of sodium hydrogen carbonate is added to a solution of acetic acid weighing 10.4 g. The two substances react, releasing carbon dioxide gas to the atmosphere....
Sodium carbonate, Na2CO3, reacts with hydrochloric acid, HCl, to produce sodium chloride, carbon dioxide and water. Refer to slide 7.18 for a summary of formulae relevant to the calculations below. 2HCl(aq) + Na.CO3(aq) + NaCl(aq) + H2O(l) + CO2(g) 1. Use this reaction to explain what is meant by the terms "acid", "conjugate base" and "salt" 2. Balance the equation for this reaction. 3. A solution was prepared by dissolving 5.00 g of Na2CO3 in water and adding water to...
I tried doing the first few but I'm not sure if I'm doing
right and I need help with the last few. the last picture is the
equation page. thank you!
Nov 23, 2015 Experiment 5 Advance Study Assignment: Identification of a Compound by Mass Relationships 1. A student attempted to identify an unknown compound by the method used in this experiment. She found that when she heated a sample weighing 0.5032 g, the mass dropped to 0.2663 g. When...
The Na,Co, solution described above was used to analyse a hydrochloric acid solution of unknown concentration. It was found that 24.30 mL of the Na,Co, solution was required to neutralise a 20.00 mL sample of the hydrochloric acid solution. 4. Using your answer to part 3 above, calculate the amount of Na,Co, present in 24.30 mL of the Na,Co, solution. (2 marks) 5. Using your answer to part 2 above, deduce the amount of HCl that was present in the...
Johnny wished to create a 0.300 M NaCl solution. Johnny only had 50.0 mL of water, however. To create his goal solution, Johnny knew he needed to know the molar mass of NaCl, which was [Select ] Next, to find the the number of moles of Naci he needed, Johnny simply multiplied the [Select] by the volume of water, in liters, which was [Select) L. Then, he calculated the number of grams of NaCl he needed taking this number of...
1) One hundred (100) ml of a 1.00 M solution of HCl is diluted with water to prepare a 0.200 M solution. What is the volume of the resulting 0.200 M solution? Or asked another way, to what volume must the original solution be diluted? (3 points) 2) Lithium hydroxide, LiOH, is used in spacecraft to absorb the carbon dioxide exhaled by astronauts. Given 1.3 kg of LiOH, how many kg of CO2 can be absorbed? (10 Pts. The reaction...
8-15
8. If S0.0 mL. of a 0.10 M solution of sodium chloride is mixed with 50.0 mL of 0.10 M magnesium chloride, what is the molar concentration of chloride in the resulting solution? a. 0.10M b. 0.20 M c. 0.05 M d. 0.15 M e. 0.25 M 9. What would be the products in the ionic equation for the following reaction? 2HBr(aq) + 2KOH(aq) → products 1. KTaq) and Br(aq); tl. KH(aq); III. H,0(1); IV KBr(s); V. BORI(aq); VI....
I
need it right now, please help me??
PROCEDURE PART I: DILUTING THE VINEGAR SOLUTION The vinegar solution must be diluted by a factor of 5 to be suitable for titration. 1. Obtain - 20 ml of the stock vinegar solution from the fume hood. 2. Using the 10-ml. pipet, pipet" 10 mL of the stock solution to a 50-ml volumetric flask. 3. Fill the volumetric flask to the calibration line with distilled water. Be sure not to go over...
3.355 M K2SO4 solution can be prepared by A) dilution of 500.0 mL of 1.00 MK2SO4 to 1.00 L B) dissolving 46.7 g of K2SO4 in water and diluting to 500.0 ml, then diluting 25.0 ml of this solution to a total volume of 500.0 mL C) dissolving 46.7 g of K2SO4 in water and diluting to a total volume of 250.0 mL D) dilution of 1.00 mL of 0.355 M K2SO4 to 1.00 L E) diluting 46.7 mL of...
Most questions answered within 3 hours.
-
TRUE OR FALSE
In case of a competitive tender procedure, in the request for
quotation, the...
asked 1 minute from now -
I am a little behind please provide some explanation, will
provide thumbs up.
This question considers...
asked 1 minute ago -
Let say the utility function as U(X,Y) = lnX + Y. Show that the
marginal rate...
asked 6 minutes ago -
A current of I=8.0A is flowing in a typical extension cord of
length L=3.00m. The cord...
asked 9 minutes ago -
1. When balancing the equation H2SO4 (aq) + NaOH (aq) →
Na2SO4(aq) + H2O(aq), would you...
asked 47 minutes ago -
Provide a definition of “classification hierarchy” and
illustrate your definition with an example of how and...
asked 24 minutes ago -
1. Describe the four main green solvents. Provide one example of
the use of each solvent....
asked 28 minutes ago -
International ethics focus on:
1) exploitation of labor
2)corruption
3) environmental impact
4) none of the...
asked 39 minutes ago -
Costing Models You work for XYZ trucking and your boss has asked
you to figure out...
asked 31 minutes ago -
A 24.6 g sample of brass is heated in a flask to 125°C in
boiling water...
asked 40 minutes ago -
Which drug candidates are most effective at docking with COX1
and COX2 respectively?
COX1: flurbiprofen, COX2:...
asked 53 minutes ago -
You place the left end of the rod on a fulcrum, and hang the
right end...
asked 54 minutes ago