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Q.

20 mL of calcium hydroxide was consumed when it was reacted with 10 mL of unknown solution of H2SO4. Also 20 mL standard solution of 0.5 MHCl containing 2 drops of phenolphthalein was titrated with calcium hydroxide, the mixture showed pink colour when burette displayed the value of 35.5 mL whereas the burette showed 25.5 mL initially. The concentration of H2SO4 is ________ M. (Nearest integer)

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Detailed Solution

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Volume of Ca(OH)2 =  35.5−25.5=10ml.
In 10ml of Ca(OH)2 5m moles are present.
In 20ml, 10m moles of Ca(OH)2 are present.
∴10m moles of H2SO4=V×M =10×M ∴M=1M
 

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