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Question

200ml of 1MH2SO4, 300ml of 3M HCl and 100ml of 2MHCl are mixed and made up to 1litre. The proton concentration in the resulting solution is:

A
1.25M
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B
1.5M
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C
2.5M
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D
0.75M
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Solution

The correct option is C 2.5M
H2SO4 contains two H+ ions
So 200 ml of H2SO4 contains 0.2l×1mol/l×2=0.4 mol H+
similarly 300 ml of HCL of 3M contains 0.3l×3mol/l×1=0.9 mol H+
similarly 100 ml of HCL of 2M contains 0.1l×2mol/l×1=0.2 mol H+
So Total number of moles =0.4+0.9+0.2=1.5 mol
Total volume =200ml+300ml+100ml=600ml or 0.6 l
Concentration of H+=1.5/0.6mol/l=2.5mol/l

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