58. A student makes a 3 molar (3M) calcium chloride (CaCl2) solution. The student leaves the...
58. A student makes a 3 molar (3M) calcium chloride (CaCl2) solution. The student leaves the solution in an uncovered beaker for several days before using the solution. Using your understanding of concentration and molarity, describe how this student's calcium chloride solution changes over time.
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58. A student makes a 3 molar (3M) calcium chloride
(CaCl2) solution. The student leaves the...
Hydrates: 1a. Calcium chloride (CaCl2) is available; the procedure calls for an 8% CaCl2•10 H20 solution....
Hydrates: 1a. Calcium chloride (CaCl2) is available; the procedure calls for an 8% CaCl2•10 H20 solution. What would be the procedure for making 2,000 mL of the desired concentration? 1b. How many grams of CuSO4•5 H20 are needed to make 1 L of a 1% solution of CuSO4? 1c. How many grams of Co(NO3)2•6 H2O are needed in preparing 400 mL of a 0.02% solution of Co(NO3)2? 1d. A 9% CuSO4 (anhydrous) solution is made up by dissolving 9 g...
When 5.5 g of CaCl2 is dissolved in 1 L of solution, the concentration of CaCl2...
When 5.5 g of CaCl2 is dissolved in 1 L of solution, the concentration of CaCl2 is 0.05 molar (0.05 M CaCl2). The solution is also described as being 0.05 M Ca2+(aq) and 0.10 M Cl−(aq). The same solution could be referenced as [Ca2+] = 0.05 M. The circle represents a unit volume. It can be interpreted as “1 L”. Exploring the Model 12. What do the brackets [ ] mean? 13. Explain why the concentration of chloride is twice...
4. In an experiment, when 23.6 of calcium chloride, CaCl2 were dissolved in water in a...
4. In an experiment, when 23.6 of calcium chloride, CaCl2 were dissolved in water in a coffee- cup calorimeter (at constant pressure), the temperature rose from 25.0°C to 38.7°C. The dissolution process is: CaCiz(s) - Ca2+ (aq) + 2C1-(aq) The heat capacity of the solution and the calorimeter is 1258 J/°C. The molar mass of CaCl2 is 110.98 g/mol. 1) Determine the heat that was absorbed by the solution and calorimeter. (1 point) 2) Determine the heat that was released...
DATA ANALYSIS Part 1 - Precipitation, Filtration, and Drying of Calcium Carbonate 1. Write a balanced chemical equ...
DATA ANALYSIS Part 1 - Precipitation, Filtration, and Drying of Calcium Carbonate 1. Write a balanced chemical equation for the reaction between calcium chloride and potassium carbonate. K2CO3 (aq) + CaCl2 (aq) > CaCO3 (s) + 2 KCl (aq). 2. Using stoichiometry, calculate the limiting reactant and the theoretical yield (the mass of Caco, product) for the reaction. 3. What is the actual yield of Cacox(s) formed from your experiment? Show your work. 4. Determine the percent yield of the...
1. A solution is made by dissolving 3.875 g of magnesium chloride in enough water to...
1. A solution is made by dissolving 3.875 g of magnesium chloride in enough water to make 200.0 mL of solution. Calculate the molarity of magnesium chloride solution. A. 0.04070 M B. 2.03510-4 M C. 0.2035 M D. 0.3242 M E. 8.14010-3 M 2. How many grams of Na2SO4 (MM 142.04 g/mol) are in 250. mL of a solution that has a concentration of 0.115 M? A. 4.08 g B. 2.02 g C. 6.25 g D. 1.14 g E. 3.07...
Name: Determination of Solution Concentration by Spectrophotometry PRELAB QUESTIONS 1. A student measures the absorbance of...
Name: Determination of Solution Concentration by Spectrophotometry PRELAB QUESTIONS 1. A student measures the absorbance of an unknown after placing a sample in a cuvette which contained some water. How will this affect the concentration he reports? 2. Explain why it is all right to leave water in the volumetric flask before you put in the 10.00 mL of your unknown. 3. A 1.3 x 10-M solution of an unknown substance has an absorbance of 0.345 at its max. a)...
Part A and Part B. Also question #3-post lab. (its circled) A. Molar Solubility and Solubility Product of Calcium Hydroxide Trial I Trial 3 Trial 2 25.0 1. Volume of saturated Ca(OH), solution (m...
Part A and Part B.
Also question #3-post lab. (its circled)
A. Molar Solubility and Solubility Product of Calcium Hydroxide Trial I Trial 3 Trial 2 25.0 1. Volume of saturated Ca(OH), solution (mL) 2. Concentration of standardized HCl solution (molU/L) 3. Buret reading, initial (mL 4. Buret reading, final (mL) 5. Volume of HCI added (mL) 6. Moles of HCI added (mol) 7. Moles of OH" in saturated solution (mol) 8. (OH1, equilibrium (mol/L) 9. (Ca2 ], equilibrium (mol/L)...
The reagents that were in the choices were BaCl2 and CaCl2 and I chose BaCl2. The...
The reagents that were in the choices were BaCl2 and CaCl2 and
I chose BaCl2.
The detailed picture it is talking about (Q#2) is also posted
below to help.
*Only the first question which is visible
second pic is only there as an additional info if needed
QUESTION 4 Determining the amount of sulfate ion (SO221) dissolved in seawater in the unit of molarity QUESTION Using the reagent you pick in the previous Question #3, write up a very detailed...
need help!! 7-3: Analysis of a Ferrous Chloride Sample Titrations provide a method of quantitatively measuring...
need help!!
7-3: Analysis of a Ferrous Chloride Sample Titrations provide a method of quantitatively measuring the concentration of an unknown solution. This is done by delivering a titrant of known concentration into an analyte of known volume. (The concentration of an unknown titrant can also be determined by titration with an analyte of known concentration and volume.) In oxidation-reduction (redox) titrations, the voltage resulting from the mixture of an oxidant and reductant can be measured as the titration proceeds....
3. If 15.0 mL of 0.125 M phosphoric acid is titrated with 0.100 M NaOH, what...
3. If 15.0 mL of 0.125 M phosphoric acid is titrated with 0.100 M NaOH, what volume of the titrant (in mL) must be added to completely neutralize the acid? Show all of your work (including the chemical equation). (1 point) Post-lab Questions: Experiment #9: Acid-Base Titrations Student Learning Objectives : Students will gain practice with the accurate preparation of solutions. Students will perform acid-base titrations and prepare titration curves. Students will identify strong and weak acids by the shapes...
4. In an experiment, when 23.6 of calcium chloride, CaCl2 were dissolved in water in a coffee- cup calorimeter (at constant pressure), the temperature rose from 25.0°C to 38.7°C. The dissolution process is: CaCiz(s) - Ca2+ (aq) + 2C1-(aq) The heat capacity of the solution and the calorimeter is 1258 J/°C. The molar mass of CaCl2 is 110.98 g/mol. 1) Determine the heat that was absorbed by the solution and calorimeter. (1 point) 2) Determine the heat that was released...
DATA ANALYSIS Part 1 - Precipitation, Filtration, and Drying of Calcium Carbonate 1. Write a balanced chemical equation for the reaction between calcium chloride and potassium carbonate. K2CO3 (aq) + CaCl2 (aq) > CaCO3 (s) + 2 KCl (aq). 2. Using stoichiometry, calculate the limiting reactant and the theoretical yield (the mass of Caco, product) for the reaction. 3. What is the actual yield of Cacox(s) formed from your experiment? Show your work. 4. Determine the percent yield of the...
Name: Determination of Solution Concentration by Spectrophotometry PRELAB QUESTIONS 1. A student measures the absorbance of an unknown after placing a sample in a cuvette which contained some water. How will this affect the concentration he reports? 2. Explain why it is all right to leave water in the volumetric flask before you put in the 10.00 mL of your unknown. 3. A 1.3 x 10-M solution of an unknown substance has an absorbance of 0.345 at its max. a)...
Part A and Part B.
Also question #3-post lab. (its circled)
A. Molar Solubility and Solubility Product of Calcium Hydroxide Trial I Trial 3 Trial 2 25.0 1. Volume of saturated Ca(OH), solution (mL) 2. Concentration of standardized HCl solution (molU/L) 3. Buret reading, initial (mL 4. Buret reading, final (mL) 5. Volume of HCI added (mL) 6. Moles of HCI added (mol) 7. Moles of OH" in saturated solution (mol) 8. (OH1, equilibrium (mol/L) 9. (Ca2 ], equilibrium (mol/L)...
The reagents that were in the choices were BaCl2 and CaCl2 and
I chose BaCl2.
The detailed picture it is talking about (Q#2) is also posted
below to help.
*Only the first question which is visible
second pic is only there as an additional info if needed
QUESTION 4 Determining the amount of sulfate ion (SO221) dissolved in seawater in the unit of molarity QUESTION Using the reagent you pick in the previous Question #3, write up a very detailed...
need help!!
7-3: Analysis of a Ferrous Chloride Sample Titrations provide a method of quantitatively measuring the concentration of an unknown solution. This is done by delivering a titrant of known concentration into an analyte of known volume. (The concentration of an unknown titrant can also be determined by titration with an analyte of known concentration and volume.) In oxidation-reduction (redox) titrations, the voltage resulting from the mixture of an oxidant and reductant can be measured as the titration proceeds....
3. If 15.0 mL of 0.125 M phosphoric acid is titrated with 0.100 M NaOH, what volume of the titrant (in mL) must be added to completely neutralize the acid? Show all of your work (including the chemical equation). (1 point) Post-lab Questions: Experiment #9: Acid-Base Titrations Student Learning Objectives : Students will gain practice with the accurate preparation of solutions. Students will perform acid-base titrations and prepare titration curves. Students will identify strong and weak acids by the shapes...
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