Number 51 is 0.00150 ml to l
and number 53 is sodium hydrogen carbonate
need on all of them

The answer to your question is

51.- 1.59 x 10⁻⁶

53.- NaHCO₃ +  HCl  ⇒   H₂O  +  CO₂  +  NaCl

Explanation:

51.- Convert 0.00159 ml to liters

Use a rule of three

                                 1000 ml 1 l

                                 0.00159 ml   x

                                 x = (0.00159 x 1) / 1000

                                 x = 0.00000159 l = 1.59 x 10⁻⁶ l

53.- Sodium hydrogen carbonate (NaHCO₃) reacts with hydrochloric acid to produce salt, water and carbon dioxide.

Sodium hydrogen carbonate = NaHCO₃

Hydrochloric acid = HCl

Reaction

                  NaHCO₃ +  HCl  ⇒   H₂O  +  CO₂  +  NaCl

water = H₂O

carbon dioxide = CO₂

salt = NaCl