Question

In: Chemistry

1) A buffer is prepared by mixing 152 mL of 0.452 M HCl and 0.495 L...

1) A buffer is prepared by mixing 152 mL of 0.452 M HCl and 0.495 L of 0.400 M sodium acetate.

a. What is the pH?

b. How many grams of KOH must be added to 0.500 L of the buffer to change the pH by 0.18 units?

2) A buffer is prepared by mixing 52.6 mL of 0.050 M sodium bicarbonate and 10.0 mL of 0.10 M NaOH.

a. What is the pH?

b. How many grams of HCl must be added to 25.0 mL of the buffer to change the pH by 0.07 units?

Solutions

Expert Solution

1 a)

Number of mmol of HCl

Number of mmol of sodium acetate

b)

0.5 L of buffer contains mmoles of acetic acid and mmol of sodium acetate. Let W mmol of KOH is added.

53-W mmol of acetic acid will remain uneutralised. 99.9+W mmol of acetate salt will be formed.

mmol

The molar mass of KOH is 56.11 g/mol

The mass of KOH

queen_honey_blossom answered 2 years ago
Next > < Previous

Related Solutions

A buffer is prepared by mixing 206 mL of 0.452 M HCl and 0.470 L of...
A buffer is prepared by mixing 206 mL of 0.452 M HCl and 0.470 L of 0.400 M sodium acetate. What is the pH? How many grams of KOH must be added to 0.500 L of the buffer to change the pH by 0.16 units?
a. What is the pH of the buffer prepared by mixing 250. mL of 0.200 M...
a. What is the pH of the buffer prepared by mixing 250. mL of 0.200 M benzoic acid and 100. mL of 0.250M NaOH? pKa=4.19 b. A buffer containing 1.00 M concentrations of HOAc and NaOAc has a pH of 4.742. (a) What is the pH of the soln’ after 0.0100 mol of HCl has been added to 1.00 L of the buffer? (b) What is the pH of the soln’ after the addition of 0.0100 mol of NaOH? (c)...
A buffer solution was prepared by mixing 300.0 mL of a 0.200 M solution of hydroxylamine...
A buffer solution was prepared by mixing 300.0 mL of a 0.200 M solution of hydroxylamine (OHNH2, Kb = 1.1 × 10-8) and 250.0 mL of a 0.300 M solution of its hydrochloride salt (OHNH3+ Cl- ). Calculate the pH of the solution after the addition of 1.08 g of solid NaOH (molar mass = 40.00 g/mol). Assume that there is no volume change upon the addition of solid.
What is the pH of a buffer prepared by mixing 20.00 mL of 0.0300 M ammonium...
What is the pH of a buffer prepared by mixing 20.00 mL of 0.0300 M ammonium chloride with 40.00 mL of 0.0450 M ammonia? What is the resulting pH if 1.00 mL of 0.10 M HCl is added to this solution?
A buffer solution was prepared by mixing 300.0 mL of a 0.200 M solution of hydroxylamine...
A buffer solution was prepared by mixing 300.0 mL of a 0.200 M solution of hydroxylamine (OHNH2, Kb = 1.1 × 10-8) and 250.0 mL of a 0.300 M solution of its hydrochloride salt (OHNH3+ Cl- ). Calculate the pH of the solution after the addition of 1.08 g of solid NaOH (molar mass = 40.00 g/mol). Assume that there is no volume change upon the addition of solid. A. 8.22    B. 5.55 C. 6.30 D. 5.78
1. Determine the pH of the buffer solution that is prepared by mixing 259 mL of...
1. Determine the pH of the buffer solution that is prepared by mixing 259 mL of 0.0983 M BIS−TRIS propane−H (C11H27N2O6+ ) to 855 mL of 0.0729 M BIS-TRIS_propane (C11H26N2O6) ). Assume the 5% approximation is valid. Report your answer to 2 decimal places. The pKa of BIS−TRIS propane−H is 9.10. Submit Answer Tries 0/3 2. Determine the pH of the BIS−TRIS propane−H/BIS−TRIS propane buffer solution after the addition of 25.2 mL of 0.643 M solution of rubidium hydroxide to...
A buffer solution was prepared by mixing 516.9 mL of 0.25 M acetic acid and 103.8...
A buffer solution was prepared by mixing 516.9 mL of 0.25 M acetic acid and 103.8 mL of 0.89 M sodium acetate. Calculate the pH of the solution given that Ka is 1.8 x 10—5 . Answer in 2 decimal places.
Suppose 50.00 mL of 0.300 M HCl is added to an acetate buffer prepared by dissolving...
Suppose 50.00 mL of 0.300 M HCl is added to an acetate buffer prepared by dissolving 0.100 mol of acetic acid and 0.110 mol of sodium acetate in 0.100 L of solution. What are the initial and final pH values? What would be the pH if the same amount of HCl solution were added to 170 mL of pure water?
Suppose 10.00 mL of 0.200 M HCl is added to an acetate buffer prepared by dissolving...
Suppose 10.00 mL of 0.200 M HCl is added to an acetate buffer prepared by dissolving 0.100 mol of acetic acid and 0.110 mol of sodium acetate in 0.100 L of solution. What are the initial and final pH values? What would be the pH if the same amount of HCl solution were added to 125 mL of pure water? Initial pH = Final pH =
A buffer solution is prepared by mixing 20.0 mL 0.45 M HAc (acetic acid) with 35.0...
A buffer solution is prepared by mixing 20.0 mL 0.45 M HAc (acetic acid) with 35.0 mL 0.45 MNaAc (sodium acetate) (a) What is the amount of 4.0 M HAc which must be added to this buffer solution to double [H3O+]? (b) What is the amount of 2.0 M HCl that must be added to decrease the pH by 0.50? (c) How much NaOH(s) in g has to be added to the solution to raise the pH by 2.00?
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT