Homework Answers
According to HOMEWORKLIB RULES we have to answer only first one problem
pH = pKa + log(NaNO2/HNO2)
Ka for HNO2 = 4x10^-4
pKa = 3.4 (-logKa = pKa)
3.55 = 3.4 + log(A-/HA)
log(A-/HA)= 0.15
A-/HA = (10^0.15 = 1.41)
A-/HA = 1.41
A- = 1.41 HA
A- + HA = 1
1.41 HA + HA = 1
2.41 HA = 1
HA= 0.414
HNO2 = HA = 0.415 L
NaNO2 = A- = 0.585 L
CROSS CHECK
pH = pKa + log(NaNO2/HNO2)
= 3.4 + log 0.585/0.415
= 3.4 +0.149
= 3.549
=3.55
Ka of HNO2 is 4.0*10^-4 Can you work out 42 and 44 for me. Along with...
Ka
of HNO2 is 4.0*10^-4
Can you work out 42 and 44 for me. Along with
explanation.
42. What volumes of 0.50 M HNO, and 0.50 M NaNO, must be mixed to prepare 1.00 L of a solution buffered at pH = 3.55?! 43. Consider a solution that contains both CsHSN and CsH5NHNO3. Calculate the ratio [CSH N]/[CsH NH+] if the solution has the following pH values: a. pH = 4.50 2101 c. pH = 5.23 olo lo dorato b....
Calculate the equilibrium concentrations of all chemical species present in a 0.10 M H2CO3(aq) solution. What...
Calculate the equilibrium concentrations of all chemical species
present in a 0.10 M H2CO3(aq)
solution. What is the percent ionization of the acid and resulting
pH?
[H2CO3] =
[HCO3-] =
[CO32-] =
[H3O+] =
% ionization =
pH =
Acid Acetic Ammonium Formula CH:COOH NH4+ H2BO: Boric Carbonic H2CO3 HC1O2 HCOOH Chlorous Formic Hydrocyanic Perchloric 1.8 x 105 5.6 x 10-10 5.4 x 10-10 4.5 x 10-7 4.7 x 10-11 1.1 x 10-2 1.8 x 10-4 5.2 x 10-10 Very...
i need help with these questions please. Which acid is the strongest? Multiple Choice Hydrogen sulfate...
i
need help with these questions please.
Which acid is the strongest? Multiple Choice Hydrogen sulfate ion HS04– (Ka = 1.2 x 10-2 Hydrocyanic acid HCN (KA = 4.9 x 10-10, Hydrofluoric acid HF (Ka = 7.2 x 10-4) Ammonium ion NH4+ (ka =5.6 10-10) Which solution has the highest pH? Multiple Choice 12., 18- o 4.3 x 108 мон o 10 х 10-7м-он o 51 х 10-2м Но* o 19 х 10-8м-он o 10 х 10-2М Н30* Saved The...
correct answer is highlighted in pink. how do i get the pH without it being 1.6?...
correct answer is highlighted in pink. how do i get
the pH without it being 1.6?
Equilibrium Constants The following equilibrium constants will be useful for some of the problems. Substance H2CO3 Substance HCOH HNO2 НОСІ (COOH)2 Constant K = 1.8 x 10-4 Ka = 4.5 x 10-4 KA = 3.5 x 10-8 K = 7.2 x 10-4 KA = 4.0 x 10-10 Ki = very large K = 1.2 x 10-2 Ka=2.5 x 10-9 Constant Ki = 4.2 x...
How would we work this out? I know the answer is 4.89 44) In the titration...
How would we work this out? I
know the answer is 4.89
44) In the titration of 10.00mL of a 0.15M acetic acid solution (Ka 1.8 x 10-5) with 0.25M sodium hydroxide, what is the pH after 3.50 mL of the base has been added? a) 4.59 b) 4.69 c) 4.79 d) 4.89 e) 4.99
Need help with 3 and 4 on calculations. some info is on top of the page...
Need help with 3 and 4 on calculations. some info is on top of
the page
Data Sheet for Lab #10 Name: Partner: Data/Observations: Volume of (NH), SO, used: Suomi initial pH of (NH4)2SO4 6.79 Equivalence vol. of NaOH: 20.00 pH at half-equivalence: 10,63 Balanced Chemical Equation: 1. Write the balanced equation for the reaction of ammonium sulfate and sodium hydroxide. (NH4)2SO4(s)? 2 N.0H(1) Nasa, () + 2NH3(-) + 2H2O 2. Write the balanced equation showing the ammonium ion acting...
can you please answer 1,2, and 3 and show the steps 1. Calculate the pH of...
can you please answer 1,2, and 3 and show the steps
1. Calculate the pH of a buffer solution made by adding 20.0 mL of 0.200 M acetic acid solution with 10.0 mL of a 0.200 solution of sodium acetate. K, for acetic acid is 1.8 x 109. Assume the total volume is 30.0 mL. 2. Calculate the pH of a buffer solution made by mixing 10.0 mL of 0.20 M ammonia with 15.0 mL of 0,15 M ammonium chloride...
Calculate the equilibrium concentrations of all chemical species present in a 0.10 M H CO.(aq) solution....
Calculate the equilibrium concentrations of all chemical species present in a 0.10 M H CO.(aq) solution. What is the percent ionization of the acid and resulting pH? Units Units [H2CO3) = Number [HCO3) = Number [CO32) = Number [H30+) = Number Units Units % ionization = Number pH = Number Ka Acid Acetic Ammonium Formula CH3COOH NH4+ H3B03 1.8 x 10-5 5.6 x 10-10 5.4 x 10-10 Boric Carbonic H2CO3 Chlorous Formic Hydrocyanic Perchloric HCIO2 HCOOH HCN HC104 4.5 x...
CHEM 202 Chemistry of Acids & Bases-Parts 1 and 2 College of the Canyons Data L Nt CX Table 2 . S...
Need help with calculations!!
CHEM 202 Chemistry of Acids & Bases-Parts 1 and 2 College of the Canyons Data L Nt CX Table 2 . Solutions of Ammonium lon-Ammonia Acid, base, or Experimental pH neutral? Solution [NH.cil, M INHs), M 0.10 1.0 0.050 0.05 0.50 0.10 5.81 5 .22 1. 33 10.81 0.50 Calculations 1. Determine [H,O'] ] for each solution using your experimental data above and enter the data in Table 3 below Show one representative calculation below. -.10...
I need help finding calculated pH for part IV and part V please! pKa of acetic...
I need help finding calculated pH for part IV and part V
please!
pKa
of acetic acid= 4.744
su 13.21 Part IV: Dilution of Buffered and Unbuffered Solutions Calculated pH | Calculated ApH Observed pH Observed ApH Number Preparation 15 ml. HC H3O2(aq) 15 ml NaC,HO2(aq) 5 ml Solution 1 25 mL H20 5 ml Solution 2 25 ml H20 4 30 mL HC H2O2(aq) 5 ml Solution 4 25 ml H2O 5 ml Solution 5 25 ml. H2O 4.10...
Ka
of HNO2 is 4.0*10^-4
Can you work out 42 and 44 for me. Along with
explanation.
42. What volumes of 0.50 M HNO, and 0.50 M NaNO, must be mixed to prepare 1.00 L of a solution buffered at pH = 3.55?! 43. Consider a solution that contains both CsHSN and CsH5NHNO3. Calculate the ratio [CSH N]/[CsH NH+] if the solution has the following pH values: a. pH = 4.50 2101 c. pH = 5.23 olo lo dorato b....
Calculate the equilibrium concentrations of all chemical species
present in a 0.10 M H2CO3(aq)
solution. What is the percent ionization of the acid and resulting
pH?
[H2CO3] =
[HCO3-] =
[CO32-] =
[H3O+] =
% ionization =
pH =
Acid Acetic Ammonium Formula CH:COOH NH4+ H2BO: Boric Carbonic H2CO3 HC1O2 HCOOH Chlorous Formic Hydrocyanic Perchloric 1.8 x 105 5.6 x 10-10 5.4 x 10-10 4.5 x 10-7 4.7 x 10-11 1.1 x 10-2 1.8 x 10-4 5.2 x 10-10 Very...
i
need help with these questions please.
Which acid is the strongest? Multiple Choice Hydrogen sulfate ion HS04– (Ka = 1.2 x 10-2 Hydrocyanic acid HCN (KA = 4.9 x 10-10, Hydrofluoric acid HF (Ka = 7.2 x 10-4) Ammonium ion NH4+ (ka =5.6 10-10) Which solution has the highest pH? Multiple Choice 12., 18- o 4.3 x 108 мон o 10 х 10-7м-он o 51 х 10-2м Но* o 19 х 10-8м-он o 10 х 10-2М Н30* Saved The...
correct answer is highlighted in pink. how do i get
the pH without it being 1.6?
Equilibrium Constants The following equilibrium constants will be useful for some of the problems. Substance H2CO3 Substance HCOH HNO2 НОСІ (COOH)2 Constant K = 1.8 x 10-4 Ka = 4.5 x 10-4 KA = 3.5 x 10-8 K = 7.2 x 10-4 KA = 4.0 x 10-10 Ki = very large K = 1.2 x 10-2 Ka=2.5 x 10-9 Constant Ki = 4.2 x...
How would we work this out? I
know the answer is 4.89
44) In the titration of 10.00mL of a 0.15M acetic acid solution (Ka 1.8 x 10-5) with 0.25M sodium hydroxide, what is the pH after 3.50 mL of the base has been added? a) 4.59 b) 4.69 c) 4.79 d) 4.89 e) 4.99
Need help with 3 and 4 on calculations. some info is on top of
the page
Data Sheet for Lab #10 Name: Partner: Data/Observations: Volume of (NH), SO, used: Suomi initial pH of (NH4)2SO4 6.79 Equivalence vol. of NaOH: 20.00 pH at half-equivalence: 10,63 Balanced Chemical Equation: 1. Write the balanced equation for the reaction of ammonium sulfate and sodium hydroxide. (NH4)2SO4(s)? 2 N.0H(1) Nasa, () + 2NH3(-) + 2H2O 2. Write the balanced equation showing the ammonium ion acting...
can you please answer 1,2, and 3 and show the steps
1. Calculate the pH of a buffer solution made by adding 20.0 mL of 0.200 M acetic acid solution with 10.0 mL of a 0.200 solution of sodium acetate. K, for acetic acid is 1.8 x 109. Assume the total volume is 30.0 mL. 2. Calculate the pH of a buffer solution made by mixing 10.0 mL of 0.20 M ammonia with 15.0 mL of 0,15 M ammonium chloride...
Calculate the equilibrium concentrations of all chemical species present in a 0.10 M H CO.(aq) solution. What is the percent ionization of the acid and resulting pH? Units Units [H2CO3) = Number [HCO3) = Number [CO32) = Number [H30+) = Number Units Units % ionization = Number pH = Number Ka Acid Acetic Ammonium Formula CH3COOH NH4+ H3B03 1.8 x 10-5 5.6 x 10-10 5.4 x 10-10 Boric Carbonic H2CO3 Chlorous Formic Hydrocyanic Perchloric HCIO2 HCOOH HCN HC104 4.5 x...
Need help with calculations!!
CHEM 202 Chemistry of Acids & Bases-Parts 1 and 2 College of the Canyons Data L Nt CX Table 2 . Solutions of Ammonium lon-Ammonia Acid, base, or Experimental pH neutral? Solution [NH.cil, M INHs), M 0.10 1.0 0.050 0.05 0.50 0.10 5.81 5 .22 1. 33 10.81 0.50 Calculations 1. Determine [H,O'] ] for each solution using your experimental data above and enter the data in Table 3 below Show one representative calculation below. -.10...
I need help finding calculated pH for part IV and part V
please!
pKa
of acetic acid= 4.744
su 13.21 Part IV: Dilution of Buffered and Unbuffered Solutions Calculated pH | Calculated ApH Observed pH Observed ApH Number Preparation 15 ml. HC H3O2(aq) 15 ml NaC,HO2(aq) 5 ml Solution 1 25 mL H20 5 ml Solution 2 25 ml H20 4 30 mL HC H2O2(aq) 5 ml Solution 4 25 ml H2O 5 ml Solution 5 25 ml. H2O 4.10...
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