Question

QUESTION 3 3 points Save Answer To make a buffer of formic acid (Kg - 1.8 x 10-4) with a pH - 4.00, what ratio of formic acid to sodium formate is required? {Notice that I am asking for the ratio of acid to base, not base to acid!) 1.25 0.56 0.82 1.87 QUESTION 4 3 points Save Answer If you find that you need an acid to base ratio of 4.23 and you are using 50.00mL of a 1.00M acid solution, what volume of 1.00M base solution should you use? 212 ml 32.6 mL 85.9 ml. 11.8 ml QUESTION 5 3 points Save Answer If a formic acid buffer contains 0.100 moles of farmic acid and 0.100 moles of sadium formate, how many moles of each will be present after addition of 0.010 moles of NaOH 0.100 moles of formic acid and 0.110 moles of sodium formate 0.110 moles of formic acid and 0.090 moles of sodium formate 0.090 mcles formic acid and 0.110 moles of sodium formate 0.110 roles of formic acid and 0.100 moles of sodium formate QUESTION 6 3 points Save Answer If a formic acid buffer contains 0.100 moles of farmic acid and 0.100 moles of sadium formate, how many moles of each will be present after addition of 0.010 moles of HCI? 0.100 males of formic acid and 0.110 males of sodium formate 0.110 roles of formic acid and 0.090 moles of sodium formate 0.110 moles of formic acid and 0.100 moles of sodium formate 0.090 moles formic acid and 0.110 moles of sodium formate

QUESTION 3 To make a buffer of formic acid (Ka = 1.8 x 10-4) with a pH = 4.00, what ratio of formic acid to sodium formate is required? (Notice that I am asking for the ratio of acid to base, not base to acid!)

a) 1.25

b) 0.56

c) 0.82

d) 1.87

QUESTION 4 If you find that you need an acid to base ratio of 4.23 and you are using 50.00mL of a 1.00M acid solution, what volume of 1.00M base solution should you use?

a) 212 mL

b) 32.6 mL

c) 85.9 mL

d) 11.8 mL

QUESTION 5 If a formic acid buffer contains 0.100 moles of formic acid and 0.100 moles of sodium formate, how many moles of each will be present after addition of 0.010 moles of NaOH?

a) 0.100 moles of formic acid and 0.110 moles of sodium formate

b) 0.110 moles of formic acid and 0.090 moles of sodium formate

c) 0.090 moles formic acid and 0.110 moles of sodium formate

d) 0.110 moles of formic acid and 0.100 moles of sodium formate

QUESTION 6 If a formic acid buffer contains 0.100 moles of formic acid and 0.100 moles of sodium formate, how many moles of each will be present after addition of 0.010 moles of HCl?

a) 0.100 moles of formic acid and 0.110 moles of sodium formate

b) 0.110 moles of formic acid and 0.090 moles of sodium formate

c) 0.110 moles of formic acid and 0.100 moles of sodium formate

d) 0.090 moles formic acid and 0.110 moles of sodium formate

**Please answer all 4 questions. I promise to rate :)!

Answer 1

[ formic acid] ΤΟΥ Μα. риска се ослоо 4- (-log (1.8x104) log [sodium for 0.2553 = log & Sod. formate) (Tornicaid) ratio = 1.6 . ratio of acid = [fornic acid] I 10.58 base