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# Problem: Lanthanum metal forms cations with a charge of 3+. Consider the following observations about the chemistry of lanthanum: When lanthanum metal is exposed to air, a white solid (compound A) is formed that contains lanthanum and one other element. When lanthanum metal is added to water, gas bubbles are observed and a different white solid (compound B) is formed. Both A and B dissolve in hydrochloric acid to give a clear solution. When either of these solutions is evaporated, a soluble white solid (compound C) remains. If compound C is dissolved in water and sulfuric acid is added, a white precipitate (compound D) forms.Write net ionic equation for the reaction that occurs when lanthanum hydroxide is dissolved in hydrochloric acid.

###### FREE Expert Solution

lanthanum = La3+

hydroxide = OH-

lanthanum hydroxide = La(OH)3

hydrochloric acid = HCl

Cl-, Br-, and I- are soluble except when paired with Ag+, Pb2+, Cu+, Hg22+
Hydroxides (OH-) are insoluble except when with Group 1A ions (Li+, Na+, K+, etc.) and ammonium ion (NH4+) and Ca2+, Sr2+, Ba
2+

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###### Problem Details

Lanthanum metal forms cations with a charge of 3+. Consider the following observations about the chemistry of lanthanum: When lanthanum metal is exposed to air, a white solid (compound A) is formed that contains lanthanum and one other element. When lanthanum metal is added to water, gas bubbles are observed and a different white solid (compound B) is formed. Both A and B dissolve in hydrochloric acid to give a clear solution. When either of these solutions is evaporated, a soluble white solid (compound C) remains. If compound C is dissolved in water and sulfuric acid is added, a white precipitate (compound D) forms.

Write net ionic equation for the reaction that occurs when lanthanum hydroxide is dissolved in hydrochloric acid.

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