Ka = 6.2*10^-10
pKa = - log (Ka)
= - log(6.2*10^-10)
= 9.208
use:
pH = pKa + log {[conjugate base]/[acid]}
= 9.208+ log {0.6/2.15}
= 8.653
Answer: 8.65
A buffer solution contains 2.15 M hydrocyanic acid and 0.60 M cyanide ion. What is the...
A buffer solution contains 0.58 mol of hydrocyanic acid (HCN) and 0.68 mol of sodium cyanide (NaCN) in 3.00 L. The Ka of hydrocyanic acid (HCN) is Ka = 4.9e-10. (a) What is the pH of this buffer? pH = (b) What is the pH of the buffer after the addition of 0.46 mol of NaOH? (assume no volume change) pH = (c) What is the pH of the original buffer after the addition of 0.23 mol of HI? (assume...
A buffer solution contains 0.64 mol of hydrocyanic acid (HCN) and 0.59 mol of sodium cyanide (NaCN) in 5.10 L. The Ka of hydrocyanic acid (HCN) is Ka = 4.9e-10. (a) What is the pH of this buffer? pH = 9.345 (b) What is the pH of the buffer after the addition of 0.44 mol of NaOH? (assume no volume change) pH = (c) What is the pH of the original buffer after the addition of 0.25 mol of HI?...
A) A solution contains 0.424 M sodium cyanide and 0.294 M hydrocyanic acid. The pH of this solution is .B) A solution contains 0.301 M potassium fluoride and 0.204 M hydrofluoric acid. The pH of this solution is .
What molar ratio of sodium cyanide to hydrocyanic acid is necessary to prepare a buffer with pH = 9.72? Ka of HCN = 4.9 x 10-10
A solution contains 0.180 M sodium cyanide and 0.355 M hydrocyanic acid. The pH of this solution is
A solution contains 0.433 M potassium cyanide and 0.493 M hydrocyanic acid. The pH of this solution is Submit Answer Try Another Version 10 item attempts remaining
a) A solution contains 0.155 M sodium cyanide and 7.45×10-2 M hydrocyanic acid. The pH of this solution is ______________ . b) A solution contains 0.426 M sodium acetate and 0.485 M acetic acid. The pH of this solution is _______________. c)A solution contains 0.370 M potassium hypochlorite and 0.494 M hypochlorous acid. The pH of this solution is _________________.
What is the pH of a buffer system that contains 0.190 M hydrocyanic acid (HCN) and 0.280 M sodium cyanide (NaCN)? The pK_a of hydrocyanic acid is 9.31. Express your answer using two decimal places.
A 1 liter solution contains 0.448 M hydrocyanic acid and 0.597 M potassium cyanide. Addition of 0.224 moles of potassium hydroxide will: (Assume that the volume does not change upon the addition of potassium hydroxide.) оооооо Raise the pH slightly Lower the pH slightly Raise the pH by several units Lower the pH by several units Not change the pH Exceed the buffer capacity
please answer every part part 1 part 2 A buffer solution contains 0.90 mol of hydrocyanic acid (HCN) and 0.77 mol of sodium cyanide (NaCN) in 3.80 L. The K, of hydrocyanic acid (HCN) is k, = 4.9e-10. (a) What is the pH of this buffer? pH = (b) What is the pH of the buffer after the addition of 0.31 mol of NaOH? (assume no volume change) pH = (c) What is the pH of the original buffer after...