Outline how you would prepare a 0.1 M buffer solution of pH 11. b) add 5.0...

Outline how you would prepare a 0.1 M buffer solution of pH 11.

b) add 5.0 mL of 10 mM HCl to 500 mL of your buffer, calculate the pH after this addition

Expert Solution

To prepare a buffer solution of pH 11, take a weak base of concentration 0.1M and the solution of its conjugate base of concentration 0.1M with equal volumes of acid and the salt.

A slightly different path to the [OH¯]

pH = 11, so pOH = 14 - pH = 14.00 - 11 = 3

[OH¯] = 10¯^pOH = 10¯³= 0.001 M

[HB⁺] = [OH¯] =0.001 M

[B] = 0.1

K_b = [( 10¯³) ( 10¯³)] / 0.1

K_b = 1.0 x 10^-5

such type of weak base must be selected whose Kb value is 1.0 x 10^-5 .

queen_honey_blossom answered 2 years ago

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