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Burka [1]
3 years ago
8

Suppose you encounter a chemical formula with h as the cation. what do you know about this compound immediately?

Chemistry
1 answer:
jeka943 years ago
7 0

Answer:

By finding a chemical formula with H as a cation (positively charged ion), you can immediately know that the compound is an acid.

Explanation:

<u><em> By finding a chemical formula with H as a cation (positively charged ion), you can immediately know that the compound is an acid.</em></u>

According to the Arrhenius Acid-Base Theory, acids are those substances that dissolved in water divide by generating H⁺ together with an anion (ion with a negative charge). In an aqueous solution, the H⁺ protons react immediately with the water molecules to form H₃O⁺ hydronium ions.

According to this theory, those acids that dissociate completely are strong acids (releasing all protons H⁺), while acids that do not dissociate completely are weak acids (the percentage of dissociation is not 100%, releasing few protons H⁺)

An example is:

HCl + H₂O ⇒ Cl⁻ + H₃O⁺

This is an example of a strong acid.

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Calculate the pH of a buffer solution that contains 0.25 M benzoic acid (C 6H 5CO 2H) and 0.15M sodium benzoate (C
gtnhenbr [62]

Answer:

pH=3.97

Explanation:

Hello,

In this case, for the calculation of the pH of the given buffer we need to use the Henderson-Hasselbach equation:

pH=pKa+log(\frac{[base]}{[acid]} )

Whereas the pKa for benzoic acid is 4.19, the concentration of the base is 0.15 M (sodium benzoate) and the concentration of the acid is 0.25 M (benzoic acid), therefore, the pH turns out:

pH=4.19+log(\frac{0.15M}{0.25M} )\\\\pH=3.97

Regards.

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