Question

Calculate the pH change produced when 0.100 mol of gaseous HCl is added to each of...

Calculate the pH change produced when 0.100 mol of gaseous HCl is added to each of the following buffer solutions.

a) 500 mL of 0.900M NH3 and 0.900 M NH4Cl

b) 500mL of 0.200 M NH3 and 0.800 M NH4Cl

Homework Answers

Answer #1

pOH = pKb + log [acid]/[base]

pH + pOH = 14

a)

0.500L x 0.900M NH4Cl = 0.450 mol NH4+
0.500L x 0.900M NH3 = 0.450 NH3

0.450 + 0.100 = 0.550 mol NH4+
0.450 - 0.100 = 0.350 mol NH3

0.55 / 0.500 = 1.1M

0.35 / 0.500 =0.70M

Kb of NH3 = 1.8 x 10-5

pOH = 4.74 + log (1.1/.07)

pOH = 4.936

therefore;
pH = 14 -4.936
pH = 9.06

b)

Similarly;

0.500L x 0.800M NH4Cl = 0.400 mol NH4+
0.500L x 0.200M NH3 = 0.100 NH3
0.400 + 0.100 = 0.500 mol NH4+
0.100 - 0.100 = 0 mol NH3

pOH =4.74; pH = 9.26

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
Calculate the pH change produced when 0.100 mol of gaseous HCl is added to each of...
Calculate the pH change produced when 0.100 mol of gaseous HCl is added to each of the following buffer solutions. a) 500 mL of 0.900 M NH3 and 0.900 M NH4Cl b) 500 mL of 0.200 M NH3 and 0.800 M NH4Cl c) 500 mL of 0.100 M NH3 and 0.900 M NH4Cl
PS11.7. Calculate the pH change produced when 0.100 mol of gaseous HCl is added to each...
PS11.7. Calculate the pH change produced when 0.100 mol of gaseous HCl is added to each of the following buffer solutions. a) 500 mL of 0.900 M NH3 and 0.900 M NH4Cl b) 500 mL of 0.200 M NH3 and 0.800 M NH4Cl c) 500 mL of 0.100 M NH3 and 0.900 M NH4Cl
a) Calculate the change in pH when 8.00 mL of 0.100 M HCl(aq) is added to...
a) Calculate the change in pH when 8.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq). b) Calculate the change in pH when 8.00 mL of 0.100 M NaOH(aq) is added to the original buffer solution.
Calculate the change in pH when 5.00 mL of 0.100 M HCl(aq) is added to 100.0...
Calculate the change in pH when 5.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq) Change in pH = _____ Calculate the change in pH when 5.00 mL of 0.100 M NaOH(aq) is added to the original buffer solution. Change in pH= _______
1) Calculate the change in pH when 3.00 mL of 0.100 M HCl(aq) is added to...
1) Calculate the change in pH when 3.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq). 2) Calculate the change in pH when 3.00 mL of 0.100 M NaOH(aq) is added to the original buffer solution.
Calculate the change in pH when 6.00 mL of 0.100 M HCl(aq) is added to 100.0...
Calculate the change in pH when 6.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq). A list of ionization constants can be found here. change in pH = Calculate the change in pH when 6.00 mL of 0.100 M NaOH(aq) is added to the original buffer solution.
Calculate the change in pH when 3.00 mL of 0.100 M HCl(aq) is added to 100.0...
Calculate the change in pH when 3.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq). A list of ionization constants can be found here. pH= ? Calculate the change in pH when 3.00 mL of 0.100 M NaOH(aq) is added to the original buffer solution. pH=?
Calculate the change in pH when 5.00 mL of 0.100 M HCl(aq) is added to 100.0...
Calculate the change in pH when 5.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq). A list of ionization constants can be found here. Calculate the change in pH when 5.00 mL of 0.100 M NaOH(aq) is added to the original buffer solution.
4. Calculate the pH after 0.010 mol of gaseous HCl is added to 250.0 mL of...
4. Calculate the pH after 0.010 mol of gaseous HCl is added to 250.0 mL of each of the following buffered solutions. (Kb for NH3 = 1.76 x 10^5) a. 0.050 M NH3 and 0.15 M NH4Cl b. 0.50 M NH3 and 1.50 M NH4Cl
Calculate the change in pH when 3.00 mL of 0.100 M HCl(aq) is added to 100.0...
Calculate the change in pH when 3.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq). A list of ionization constants can be found here. https://sites.google.com/site/chempendix/ionization Calculate the change in pH when 3.00 mL of 0.100 M NaOH(aq) is added to the original buffer solution.