Sodium sulfide (na, s) is a product widely used in the metallurgical industry. one of the manufacturing methods
of this substance involves the saturation of a solution of sodium hydroxide (naoh) with hydrogen sulphide (h2s),
reactions 1 and 2 below.
h2s (9)
naoh (aa)
nahs (aq) +
(reaction 1)
nahs (aq)
naoh (aq)
na s (s) +
(reaction 2)
atomic masses: h 1, o 16, na 23, s 32
a) from the reactions shown, calculate the h2s mass needed to react with 1 ton of
sodium hydroxide (naoh).
b) considering that the yield of the process is equal to 70%, calculate the mass of na s obtained from
1 tonne of sodium hydroxide (