What is the component concentration ratio, [Pr−]/[HPr], of a buffer that has a pH of 5.31?(Ka of HPr = 1.3 × 10−5)

What is the pH of the buffer that results when 2.3 g of NH3 and 6.46 g of NH4Cl are dissolved in 250 mL water? (Ka for NH4+ = 5.60 × 10-10) Please give the answer to 2 decimal places.

The pKa of lactic acid is 3.86. What is the pH of a buffer in which the lactic acid concentration is 0.200 M and the sodium lactate concentration is 2.00 M?

Consider a buffer made by adding 132.8 g of NaC₇H₅O₂ to 300.0 mL of 2.35 M HC₇H₅O₂ (Ka = 6.3 x 10⁻⁵) a What is the pH of this buffer?     b What is the pH of the buffer after 0.750 mol of H⁺ have been added?     c What is the pH of the buffer after 0.250 mol of OH⁻ have been added?

Which of the following aqueous mixtures will result in a buffer with a pH higher than 7.0? (For HCNO, Ka = 2.2×10-4, for NH3, Kb = 1.8×10-5 ) 10 mL of 0.1 M NH3 + 10 mL of 0.1 M HCl  10 mL of 0.1 M NH3 + 10 mL of 0.1 M HCNO 10 mL of 0.1 M NH3 + 5.0 mL of 0.1 M HCl (Correct answer) 10 mL of 0.1 M HCNO + 10 mL of 0.1 M NaOH 10 mL of 0.1 M HCNO + 5.0 mL of 0.1 M NaOH   please explain. thanks!

What mass of sodium benzoate should you add to 158.0 mL of a 0.16 MM benzoic acid (HC7H5O2) solution to obtain a buffer with a pH of 4.29? ( Ka(HC7H5O2)=6.5×10−5)

What is the component concentration ratio, [Pr−]/[HPr], of a buffer that has a pH of 4.85?(Ka of HPr = 1.3 ×10−5)

Calculate the molar ratio of NaFNaF to HFHF required to create a buffer with pH=4.20pH=4.20 . ( Ka(HF)=6.8×10−4Ka(HF)=6.8×10−4.)

Enter your answer in the provided box. What is the component concentration ratio, [Pr−]/[HPr], of a buffer that has a pH of 4.67? (Ka of HPr = 1.3 × 10−5)

What ratio of NaCN to HCN is needed to prepare a pH 10.00 buffer? (Ka of HCN is 4.9 × 10⁻¹⁰)