Question

1) Is the solution of C5H5NHClO4 acidic, basic or neutral?

2) Is the solution of NH4NO2 acidic, basic or neutral?

3) Is the solution of NH4F acidic, basic or neutral?

4) Is the solution of CH3NH3CN acidic, basic or neutral?

Answer 1

1) Is the solution of C5H5NHClO4 acidic, basic or neutral?

this solution is acidic.

here HClO4 is a strong acid, C5H5N is a weak base. so the solutionis acidic

2) Is the solution of NH4NO2 acidic, basic or neutral?

this solution is acidic

NH4NO2 + H2O ------------------> NH4OH + HNO2

this is the salt of a weak acid/weak base (HNO2/NH4OH). here NH4OH is a stronger acid than HNO2. so this is acidic

3) Is the solution of NH4F acidic, basic or neutral?

this solution is acidic

NH4F + H2O --------------> NH4OH +HF

..............................................weak base strong acid

its combination of weak base, strong acid

4) Is the solution of CH3NH3CN acidic, basic or neutral?

this solution is neutral

this is a combination of a weak acid and weak base.