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Question

20 mL of x M HCl neutralizes completely 10 mL of 0.1 M NaHCO3 solution and a further 5 mL of 0.2 M Na2CO3 solution to methyl orange end point. The value of x is:

A
0.167 M
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B
0.133 M
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C
0.15 M
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D
0.2 M
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Solution

The correct option is B 0.15 M
20 mL of x M HCl=10 mL of 0.1 M NaHCO3+5 mL of 0.2 M Na2CO3
(Methyl orange indicated 100% reaction of NaHCO3 and Na2CO3)
0.2 M Na2CO3=0.4 M Na2CO3
20×x10×0.1=5×0.1×2x=0.15

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