Question

Review I Constants I Periodic Table Part A Which of the following buffer systems would be the best choice to create a buffer with pH 9.10? HF/KF Ο ΗΝΟ/KN HNO2/KNO2 NH3/NH4 Cl о HСО/КCIO HCIO/KCIO Previous Answers Submit Correct The best buffer will be the one whose weak acid component has a pKa closest to the desired pH of the buffer. Since the pKa of NH4 is 9.25, and the desired buffer pH is 9.10, the best choice for the buffer is NH3 /NH4CI Part B For the best system, calculate the ratio of the masses of the buffer components required to make the buffer. Express your answer using two significant figures. Hνα ΑΣφ VAX ? m (NH3) m (NH4 C)

I finished Part A. I just need Part B. All the information needed should be there.

Answer 1

Answer:-

This question is solved by using the simple equation of Henderson Hasselbalch equation which gives the relationship between pH and pKa.

The answer is given in the image,

Answer: Pat- в ен9.10 pka - 9.25 ря – рkаt lеа счи] [MHACI) 9.10 — 9-25 + Летния) CN407 = -0.15 Леа Счң, CN4a7 - Сния). ( Haci] Счно) 10-0-15 tv4 a = 0.71 , m (мм) - 0-71 m(Hң44)