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Helen [10]
3 years ago
11

Which of the following aqueous solutions are good buffer systems?

Chemistry
1 answer:
Delicious77 [7]3 years ago
6 0

Answer:

0.25 M ammonium nitrate + 0.40 M ammonia  

0.39 M hypochlorous acid + 0.25 M potassium hypochlorite

0.12 M hydrofluoric acid + 0.14 M sodium fluoride  

Explanation:

A buffer consists of a weak acid and its salt or a weak base and its salt.

NH₃ is a weak base, and HClO and HF are weak acids.

B is wrong. HNO₃ is a strong acid.

C is wrong. KOH is a strong base.

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What is the empirical formula for a compound whose molecular formula is P4O10
Bas_tet [7]

Answer:

The empirical formula is P2O5 (option B)

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An empirical formula does not necessarily represent the actual numbers of atoms present in a molecule of a compound; it represents only the ratio between those numbers.

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If the molecular formula is P4O10, this means for each for P-atoms we have 10-O atoms this is a ratio 4:10 or 1: 2.5

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The empirical formula is P2O5 (option B)

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