pls Question 5 What is the pH after .03 mol of OH is added to 1.0...

Question

Question

Answer 1

Answer #1

the reaction is

HSO4-(aq) + HO- (aq) ===> SO₄2- (aq) + H2O(aq) :

I 0.05 0.03 0.07 0

E 0.02 - 0.10

Since we know that

pka = 1.92

we have for buffers, pH = pKa + log [SO42- ] /[HSO4- ]

As we know wth0.03 moles of OH- added :

[SO42- ]= 0.07 moles + 0.03 moles / L = 0.10 M

[HSO4- ] = 0.05 moles - 0.03 moles / L = 0.02 M

pH = 1.92 + log (0.10/0.02)

pH =1.92+0.69

pH = 2.59

So the correct answer is option (B) 2.59

Please give me thumbs up

Add a comment

Answer 2

Similar Homework Help Questions

Question 29 3 pts Which of the following statement(s) is (are) true when the cell operates...

Question 29 3 pts Which of the following statement(s) is (are) true when the cell operates spontaneously? (That is, when e are allowed to flow whichever way they want to) 1. The Pt electrode would be the anode 2. The measured voltage would be +57 V 3. The measured voltage would be +1.79 V 4. Electrons would move from right to left (---) 1 M Bro, (aq) 1 M Br" (aq) 1 MOH(aq) 1 M Mn(aq) 2 only 3 only...
Determine the pH increase of a solution after 0.10 mol of NaOH is added to 1.00...

Determine the pH increase of a solution after 0.10 mol of NaOH is added to 1.00 L of a solution containing 0.15 M HC2H3O2 and 0.20 M NaC2H3O2. If this same amount of NaOH was added to 1.00 L of pure water then what would be the pH increase of the resulting solution? Compare these two values. pH increase in buffer: ? pH increase in pure water: ?
8. What is new pH when 0.07 mol of HCIO, is added to a buffer that...

8. What is new pH when 0.07 mol of HCIO, is added to a buffer that originally contains 0.15 mol of NaHSO and 0.15 mol of Na,SO, in 1.0 L?

Question 22 3 pts What is the pH after 20.0 mL of 1.0 M HCl is...

Question 22 3 pts What is the pH after 20.0 mL of 1.0 M HCl is added to a 1.0-L buffer solution composed of 0.75 M HCN and 0.15 M NaCN? 6.29 9.58 O 4.98 3.53 O 854
What is the pH after 0.150 mol of HCl is added to the buffer from Part...

What is the pH after 0.150 mol of HCl is added to the buffer from Part A? Assume no volume change on the addition of the acid Express the pH numerically to three decimal places. ► View Available Hint(s) ROO? V AE pH= 5.81 Submit Previous Answers X Incorrect; Try Again You used the final concentration of HA (after the addition of HCI), but you used the initial concentration of A You may want to review Hint 3. Determine the...
What is the pH if 0.035 mol NaOH is added to 2.0L of a buffer containing...

What is the pH if 0.035 mol NaOH is added to 2.0L of a buffer containing 0.10 M acetic acid, CH3COOH, and 0.10 M sodium acetate, CH3COONa? (K, for CH3COOH - 1.8 x 10-5). O pH = 6.83 O pH = 7.91 O pH = 4.89 O pH = 6.23 O pH = 5.08

What is the pH of 50 mL of a 1.0 mol/L methylamine (CH3NH2) solution after the...

What is the pH of 50 mL of a 1.0 mol/L methylamine (CH3NH2) solution after the addition of 50 mL of a 0.5 mol/L solution of HCl? 5. What is the pH of 50 mL of a 1.0 mol/L methylamine (CH3NH2) solution after the addition of 50 mL of a 0.5 mol/L solution of HCI?
What is the pH of a 1.0 L buffer made with 0.300 mol of HF (Ka...

What is the pH of a 1.0 L buffer made with 0.300 mol of HF (Ka = 6.8 × 10⁻⁴) and 0.200 mol of NaF to which 0.030 mol of HCl were added?
What is the pH of a 1.0 L buffer made with 0.300 mol of HF (Ka...

What is the pH of a 1.0 L buffer made with 0.300 mol of HF (Ka = 6.8 × 10⁻⁴) and 0.200 mol of NaF to which 0.100 mol of NaOH were added?

5. What is the pH of 50 mL of a 1.0 mol/L methylamine (CH3NH2) solution after...

5. What is the pH of 50 mL of a 1.0 mol/L methylamine (CH3NH2) solution after the addition of 50 mL of a 0.5 mol/L solution of HCI? Your angwer