Lehman College City University of New York Department of C hemistry 30. Which of

Question

Lehman College City University of New York Department of C hemistry 30. Which of the following substances should be written in m equations representing reactions in aqueous solutions? lecular form in net ionic A) NaNO2 B) KC2H302 C) FePO.4 D) Ba(OH)2 E) LizCO 31. Consider the neutralization reaction of magnesium hydroxide with hydrochloric acid to produce magnesium chloride and water. If I have 75 ml of 0.25M magnesium hydroxide, how many ml of a 1.1 M hydrochloric acid solution would I need to add to completely neutralize the base? (Hint, be sure to write the balanced chemical equation of this acid/base reaction.) A) 34.1 ml B) 17.0 ml C) 29.3 ml D) 28.8 ml 0 25

Explanation / Answer

30) The correct answer is C) FePO4, this compound is insoluble in water, so it will not dissociate and will appear at the net ionic equation as it is.

31)

Mg(OH)2 + 2HCl -----> MgCl2 + 2H2O

mol Mg(OH)2= 0.25M x 0.075L= 0.01875mol

1 mol of Mg(OH)2 reacts with 2 mol of HCl, so 0.01875mol of Mg(OH)2 reacts with 2x 0.01875mol of HCl.

mo HCl= 2x 0.01875mol= 0.0375mol

V HCl= 0.0375mol/1.1M= 0.0341L= 34.1mL

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