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Answer the given question .
0.01 M solution of
"0.01 M solution of $H_2A$ has pH equal to 4. If $K_{a1}$ for the acid is $4.45 \times 10^{-7}$, the concentration of $HA^-$ ion in solution would be Question no 10"
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The area of a rhombus whose vertices are (3, 0), (4, 5), (-1, 4) and (-2,-1) taken in order, is:
Franz looked for opportunities to skip school to do what?