Hydrofluoric acid, hf (aq), cannot be stored in glass bottles because compounds called silicates in the glass are attacked by the hf (aq). sodium silicate (na2sio3), for example, reacts as shown below. na2sio3 (s) + 8 hf (aq) h2sif6 (aq) + 2 naf (aq) + 3 h2o (l) (a) how many moles of hf are needed to react with 0.340 mol of na2sio3?

Question

Randy Wright

Chemistry

26 January, 20:22

Hydrofluoric acid, hf (aq), cannot be stored in glass bottles because compounds called silicates in the glass are attacked by the hf (aq). sodium silicate (na2sio3), for example, reacts as shown below. na2sio3 (s) + 8 hf (aq) h2sif6 (aq) + 2 naf (aq) + 3 h2o (l) (a) how many moles of hf are needed to react with 0.340 mol of na2sio3?

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Answers (1)

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Bria Waters · Answer 1

1) Chemical equation

Na2 SiO3 (s) + 8 HF (aq) - - - > H2 Si F6 (aq) + 2 Na F (aq) + 3H2O (l)

It is balanced

2) Molar ratios

1 mol Na2 SiO3 : 8 mol HF.

3) Proportion

0.340 mol Na2 SiO3 * 8 mol HF / 1mol Na2SiO3 = 2.72 mol HF.

Answer: 2.72 mol HF