What volume of `0.1 M HCOONa` solution should be added to `50ml` of `0.05 M` formic acid to produce a buffer solution of `pH=4.0`, `pK_(a)` of formic acid `=3.7`?

What volume of 0.1M sodium formate solution should be added to 50 mL of 0.05 M formic acid to produce a buffer solution of pH= 4.0 ? (pK_(a) of fomic acid = 3.80)

What volume of 0.10 M sodium formate solution should be added to 50 mL of 0.05 M formic acid to produce a buffer solution of pH = 4.0 ? pK_a for formic acid = 3.80?

What volume of 1 M sodium formate solution should be added to 50 ml of 0.05 M formic acid to produce a buffer solution of (ph=4( PK_a of formic acid =3.80)?

What volume (inml) of 0.10 M sodium formate solution should be added to 50 ml of 0.05M formic acid to produce a buffer solution of pH4. [pK_(a) for formic acid is 3.7]

What volume of 0.2 M RNH_(3)CI solution should be added to 100 mL of 0.1 M RNH_(2) solution to produce a buffer solution of pH=8.7 ? [Given : pK_(b) of RNH_(2)=5 , log 2=0.3]

How much volume of 0.2 M solution of acetic acid shouls be added to 100 ml of 0.2 M solution of sodium acetate to prepare a buffer solution of pH 5.00 ? pK_(a) for acid is 4.74

How much volume of 0.2 M solution of acetic acid shouls be added to 100 ml of 0.2 M solution of sodium acetate to prepare a buffer solution of pH 5.00 ? pK_(a) for acid is 4.74