a) Silane, SiH 4 , is prepared according to the following equations: Si (s) + 3

Question

a) Silane, SiH4, is prepared according to the following equations:

Si(s)  +  3 HCl(g)  ?  HSiCl3(l)  +  H2(g)

4 HSiCl3(l)  ?  SiH4(g)  +  3 SiCl4(l)

If you use 2.51 moles of solid silicon, how many moles of silane can you obtain?

b) A 23.4 mL sample of 1.00 M of phosphoric acid is titrated with a 1.00 M sodium hydroxide solution.  How many milliliters of the sodium hydroxide solution are required for titration of the phosphoric acid?

c) When concentrated sulfuric acid (18.0 M) is added to sodium chloride, hydrogen chloride gas is formed.

H2SO4(l)  +  NaCl(s)  ?  NaHSO4(s)  +  HCl(g)

When 50.0 mL of concentrated sulfuric acid is added to 4.87 g of sodium chloride, what volume (in mL) of hydrogen chloride gas is obtained at 1.00 atm pressure and 25oC?

d) When a sample of oxalic acid (H2C2O4), which is a diprotic acid, is titrated with 0.250 M potassium hydroxide solution, 24.44 mL of the potassium hydroxide solution are required to neutralize the acid.  How many grams of oxalic acid where present in the sample?

2 KOH(aq)  +  H2C2O4(s)  ?  K2C2O4(aq)  +  2 H2O(l)

Your answer should have 3 significant figures.

e) A sodium sulfate solution is added to a 25.0 mL sample of a solution containing Ba2+ ions until no more precipitate formed.  The precipitate is collected, dried, and weighed.  If 1.54 g of the precipitate are obtained, what is the concentration (in M) of Ba2+ ions in the 25.0 mL sample?

Explanation / Answer

a)0.6275

b)70.2 ml

c)2034 ml

d)0.5499 gm

e)0.26M

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