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M=n/V=2.10^-2/200.10^-3
=10^-1
H2SO4->2H^+ +SO4^2-
1:2:1
n=2
[H+]=M*n
=10^-1.2
=2.10^-1
pH=-log[H+]
=-log2.10^-1
=1-log2