9.8 g of H2SO4 is dissolved in enough water to
make 500 mL of solution. The molarity of H+ and so ion in the solution respectively are ?
(Assume 100% ionisation of H2SO4, molar mass
of H2SO4 = 98 g mol-1
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Answer:
Molarity of H
2
SO
4
=
98×500
9.8×1000
=0.2M
As H
2
SO
4
is strong acid so it dissociates completely to give H
+
ions.
H
2
SO
4
→2H
+
+SO
4
2−
0.2
0.2×2 0.2
[H
+
]=2×0.2=0.4M
pH=−log([H
+
])=0.3979
Explanation:
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