Question

when dissolved in water, which of the following salts will make the solution acidic: KCl, FeCl3, NaNO3, CaCO3, LiF, and NH4Br

can someone explain it to me, which ones and why?

Answer 1

Types of salts:
Acidic salt: Strong acid reacts with weak base to form acidic salt.
HCl + NH4OH ----> NH4Cl + H2O

Basic salt: strong base reacts with weak acid to form basic salt.

KOH + CH3-COOH ----> CH3-COOK + H2O

Neutral salt: strong acid reacts with string base

HCl + NaOH ----> NaCl + H2O

Weak acid reacts with weak base to form neutral salt.
CH3-COOH + NH4OH ---->CH3COONH4 + H2O

----

KCl + H2O -----> KOH (SB) + HCl (SA)

So the solution is nuetral

FeCl3 + 3 H2O -----> Fe(OH)3 (WB) + 3HCl (SA)

So the solution is acidic.

NaNO3 + H2O -----> NaOH (SB) + HNO3(SA)

So the solution is nuetral

CaCO3 + 2H2O ------> Ca(OH)2 (SB) + H2CO3(WA)

So the solution is basic

LiF + H2O -----> LiOH (SB) + HF(WA)

So the solution is basic

NH4Br + H2O ----> NH4OH(WB) + HBr(SA)

So the solution is Acidic