Making Salts
Q1.
Calcium chloride (CaCl2) is a soluble salt.
Calcium chloride can be made by reacting dilute hydrochloric acid with either solid calcium oxide or solid calcium carbonate.
(a)     Name the type of reaction that takes place when dilute hydrochloric acid reacts with calcium oxide.
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(1)
(b)     Write a balanced symbol equation for the reaction of dilute hydrochloric acid with calcium oxide.
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(2)
(c)     A student added solid calcium oxide to dilute hydrochloric acid in a beaker.
The student added solid calcium carbonate to dilute hydrochloric acid in another beaker.
Describe one difference between the two reactions that the student would see.
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(1)
(d)     Describe how crystals of calcium chloride can be made from calcium carbonate and dilute hydrochloric acid.
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(4)
(e)     A student dissolved some crystals of a salt in water.
The student added sodium hydroxide solution to the salt solution.
The student added sodium hydroxide solution until it was in excess.
(i)      Describe what the student would see if the salt contained calcium ions.
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(2)
(ii)     Why does the result you have described in part (e)(i) not prove that the salt contains calcium ions?
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(1)
(iii)    Describe an additional test the student could do that would prove the salt contains calcium ions.
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(2)
(Total 13 marks)