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jok3333 [9.3K]
3 years ago
7

Mass box A = 10 grams; Mass box B = 5 grams; Mass box C—made of one A and one B

Chemistry
1 answer:
anzhelika [568]3 years ago
3 0
2 boxes of A
Because C=A+B
2 of A = 20 grams
at the other hand we have 2 of B =10
So 20 + 10 = 30 grams
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An unknown acid solution has PH 3.4. 66% of the acid is ionized. Whats the pka?
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pKa=3.58

Explanation:

Hello,

In this case, since the pH defines the concentration of hydrogen:

pH=-log([H^+])

[H^+]=10^{-pH}=10^{-3.4}=3.98x10^{-4}

And the percent ionization is:

\% \ ionization=\frac{[H^+]}{[HA]}*100\%

We compute the concentration of the acid, HA:

[HA]=\frac{[H^+]}{\% \ ionization}*100\%=\frac{3.98x10^{-4}}{66\%}  *100\%\\\\

[HA]=6.03x10^{-4}

Thus, the Ka is:

Ka=\frac{[H^+][A^-]}{[HA]}=\frac{3.98x10^{-4}*3.98x10^{-4}}{6.03x10^{-4}}\\  \\Ka=2.63x10^{-4}

So the pKa is:

pKa=-log(Ka)=-log(2.63x10^{-4})\\\\pKa=3.58

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