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JEE Main202329 Jan 2023Morning ShiftChemistryIonic EquilibriumActual

Millimoles of calcium hydroxyide required to produce 100 mL of the aqueous solution of pH 12 is x × 10 - 1 . The value of x is _____ (Nearest integer). Assume complete dissociation.

Correct answer

0

Step-by-step solution

We know, pH   =   - log [ H + ] , pH   =   - log [ OH - ] ,   pH   +   pOH   =   14 ∵     pH = 12 ∴       H + = 10 - 12 M ∴       OH - = 10 - 2 M We also know, Ca ( OH ) 2   ⇌   2 OH -   +   Ca 2 + ∴   Ca ( OH ) 2 = 5 × 10 - 3 M 5 × 10 - 3 = milli moles of   Ca OH 2   100 mL milli moles of Ca OH 2 = 5 × 10 - 1 Ans. = 5

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