The causal relationship of statement

2006-12-25 12:32 am

1.

a)Limestone does not react with water.

b)Limestone is insoluble in water.

Model Ans: Two statements are correct but statement b) is not a correct explanation of a)

Why?

2.

a)Calcium carbonate is soluble in dilute hydrochloric acid.

b)Calcium carbonate reacts with dilute hydrochloric acid to form soluble calcium chloride.

Model Ans: Both a) and b) statements are correct.

Why?

Please answer in details.

回答 (1)

Cheung

2006-12-25 12:58 am

✔ 最佳答案

1.
a)Limestone does not react with water.
This is true that limestone does not react with water.

b)Limestone is insoluble in water.
All carbonates are insoluble in water except potassium, sodium and ammonium carbonates.

Two statements are correct but statement b) is not a correct explanation of a)
Limestone does not react with water NOT because of its insolubilty but because of the unfavourable enthlapy change.

2.
a)Calcium carbonate is soluble in dilute hydrochloric acid.
CaCO3+2HCl--->CaCl2+CO2+H2O

b)Calcium carbonate reacts with dilute hydrochloric acid to form soluble calcium chloride.
CaCO3+2HCl--->CaCl2+CO2+H2O
All chlorides are soluble in water except AgCl and PbCl2

參考: ME~

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