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JEE Main202324 Jan 2023Evening ShiftChemistryIonic EquilibriumActual

If the pKa of lactic acid is 5 , then the pH of 0 . 005 M calcium lactate solution at 25 ° C is __________ × 10 – 1 (Nearest integer)

Correct answer

0

Step-by-step solution

Concentration of calcium lactate = 0 . 005   M concentration of lactate ion = =   ( 2   ×   0 . 005 )   M Calcium lactate is a salt of weak acid + strong base ∴ Salt hydrolysis will take place for a basic salt: ⇒ pH = 7 + 1 2 pKa + 1 2 logC = 7 + 1 2 × 5 + 1 2 log ( 0 . 01 ) = 85   ×   10 - 1

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