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galina1969 [7]
3 years ago
14

Need the answer help please

Chemistry
1 answer:
Darina [25.2K]3 years ago
3 0

Answer:

b.

Explanation:

absorption, evaporation, and dissolving are all physical changes

bubbles forming, however, is a chemical reaction

- Hope that helped! Please let me know if you need a further explanation.

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Suppose 10.0 mL of 2.00 MNaOH is added to (a) 0.780 L of pure water and (b) 0.780 L of a buffer solution that is 0.682 Min butan
katrin2010 [14]

Answer:

a) pH will be 12.398

b) pH will be 4.82.

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The new concentration of /NaOH will be:

molarity=\frac{molesofsolute}{volumeofsolution}=\frac{0.02}{0.79}=0.025M

the [OH⁻] = 0.025

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pH = 14 -pOH = 12.398

b) The buffer has butanoic acid and butanoate ion.

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pH=pKa+log\frac{[salt]}{[acid]}

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ii) on addition of base the pH will increase.

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