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Question

200 mL of a 1 M HNO3 solution is mixed with 300 mL of 6 M HNO3 and the final solution is diluted to 1000 mL. Calculate the concentration of H+ ions.

A
2 M
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B
1 M
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C
4 M
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D
6 M
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Solution

The correct option is A 2 M
Let M be the molarity of the final solution.
Conserving the total moles before and after mixing:
M1V1+M2V2=MV
where M2 and V2 are the molarity and volume of 1 M solution.
M1 and V1 are the molarity and volume of 6 M solution.
So,
(M×1000)=(1×200)+(6×300)
On solving, molarity = 2 M
Since HNO3 dissociates to H+ ion and NO3 ion
Concentration of H+ ions=2 M

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