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Q.

5g of NaOH was dissolved in deionized water to prepare a 450 mL stock solution.  What volume (in mL) of this solution would be required to prepare 500 mL of 0.1 M solution?______
Given : Molar Mass of Na, O and H is 23, 16 and 1g mol-1 respectively.

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answer is 180.

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Detailed Solution

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Molarity of stock soln =nV=(5/40)0.45
On dilution : M1V1 = M2V2
5/400.45×V=0.1×500
V = 180ml

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