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Q.

What is the pH of 10 L aqueous solution containing 0.016 mg of sodium bicarbonate at 25°C ? Give the value to nearest integer ? 
Note-1 : pka1 and pka2 are 7 and 11 at 25°C . 
Note-2 : KW of water at is 10-14 at 25°C . 
Note-3 : Solution contains water, hydronium ions, hydroxyl ions, sodium ions, bicarbonate ions, carbonate ions of various range of concentrations

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answer is 7.

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Detailed Solution

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Concentration of sodium bicarbonate is:

0.016 mg84 g/mol×1 g1000 mg×110 L=1.19×10-7

For very low concentration, pH is unaffected.

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