3 Observe that every cation was initially part of a nitrate

3. Observe that every cation was initially part of a nitrate compound. Most anions were initially part of a sodium compound. Would you guess nitrate compounds and sodium compounds to be soluble or insoluble? Why? 4. A precipitation reaction for copper and carbonate ions would look like this: Cu2+ (aq) + CO 2 (aq) CuC03 (s) A precipitation reaction for copper and hydroxide ions would look like this: Cu2+ (aq) + 2 OH\' (aq) Cu(OH)2 (s) a. Write the precipitation reaction for one of the phosphate compounds. 5. If nitrates (NOs) are soluble and most sulfates (SO4) are soluble (except Pb2, Ca2*, Sr2\" Hg:2, and Ba2), will an ionic compound precipitate from the following: Co(NO3)2 (aq) + Na:SO4(aq) ?

Solution

Solution:- (3) As per the solubility rules, Nitrates are soluble and first group metal compounds are also soluble. Sodium is the first group metal so all it\'s compounds are soluble.

(4) (a) The precipitation reaction of Cu⁺² ion with PO₄^3- would be as follows...

3Cu²⁺(aq) + 2PO₄^3-(aq) ------> Cu₃(PO₄)₂(s)

(5) A double displacement reaction takes place in which we interchange the ions.

Co(NO₃)₂(aq) + Na₂SO₄(aq) ------> CoSO4(aq) + 2NaNO₃(aq)

No precipitate would form as Co²⁺ is not in the exceptions for sulfates and also all the compounds of first group metals are soluble.