a sample of ammonium sulphate is dissolved in 100 ml solution. to ths solution, excess of NaOH is added and ammonia gas is evovled. ammonia gas evolvd is passed in 300 ml of N/5 SULPHURIC ACID solution. water is added to make volume 500ml. 20 ml of this solution required 16 ml of N/10 NaOH solution. find amount of ammonium sulphate in sample?