How much volume of `0.1M Hac` should be added to `50mL` of `0.2M NaAc` solution to have a `pH 4.91`?

How much (volume) of 0.001 M HCl (aq) should be added to 10 mL of 0.001 M NaOH to change its pH by one unit?

What volume of 0.10 M H_(2)SO_(4) must be added to 50 mL of a 0.10 NaOH solution to make a solution in which molarity of the H_(2)SO_(4) is 0.050M?

What volume of 0.10 M H_(2)SO_(4) must be added to 50 mL of a 0.10 NaOH solution to make a solution in which molarity of the H_(2)SO_(4) is 0.050M?

How much water should be added to '300 mL' of 0.5 M NaOH solution so as fo prepare a solution of 0.2 M?

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 ?

How much of 0.3 M NH_(4)OH should be mixed with 30mL of 0.2M solution of NH_(4)CI to given butter solution of pH 8.65?

How much volume of 6 M solution of NaOH is required to prepare 500 mL of 0.250 M NaOH solution.