1
answer
0
watching
108
views
17 Nov 2019
A certain chemical reaction runs very slow at high pH values and very fast at lower pH values. To study the reaction, a chemist needs to buffer the solution at a basic pH. What would be the pH of a buffer solution that had the following concentrations: 0.42 M NH_4Cl and 0.75 M NH_3 = 1.8 times 10^-5 at 25 degree C. 9.00 4.49 9.51 11.57 To culture a certain bacteria a microbiologist would like to buffer the media at a pH of 3.75. To maximize t efficiency of the system a 1:1 ratio of acid to salt will be used. Which of the following acids would make th choice for the buffer? Acetic acid; K_a = 1.8 times 10^-5 Propanoic acid; K_a = 1.3 times 10^-5 Formic acid; K_a = 1.8 times 10^-4 Nitrous acid; K_a = 4.0 times 10^-4
A certain chemical reaction runs very slow at high pH values and very fast at lower pH values. To study the reaction, a chemist needs to buffer the solution at a basic pH. What would be the pH of a buffer solution that had the following concentrations: 0.42 M NH_4Cl and 0.75 M NH_3 = 1.8 times 10^-5 at 25 degree C. 9.00 4.49 9.51 11.57 To culture a certain bacteria a microbiologist would like to buffer the media at a pH of 3.75. To maximize t efficiency of the system a 1:1 ratio of acid to salt will be used. Which of the following acids would make th choice for the buffer? Acetic acid; K_a = 1.8 times 10^-5 Propanoic acid; K_a = 1.3 times 10^-5 Formic acid; K_a = 1.8 times 10^-4 Nitrous acid; K_a = 4.0 times 10^-4
Irving HeathcoteLv2
15 Jun 2019