Calculate the pH of buffer solution prepared by dissolving 0.20 mol of sodium cyanate (NaCNO) and 1.0 mol of cynic acid (HCNO) in enough water to make 1.0 litre of slution. K a ( H C N O ) = 2.0 × 1 0 - 4 .

Question

Calculate the pH of buffer solution prepared by dissolving 0.20 mol of sodium cyanate (NaCNO) and 1.0 mol of cynic acid (HCNO) in enough water to make 1.0 litre of slution. K a ( H C N O ) = 2.0 × 1 0 - 4 ., 0, 3.0, 4.4, 5.0

MARKS App · Accepted Answer

pH = - l o g K a ( H C N O ) + l o g [ N a C N O ] [ H C N O ] = − log ( 2.0 × 10 − 4 ) + log 0.20 mol/L 1.0 mol/L = 3.7 + ( - 0.67 ) = 3.03 ≃ 3.0

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