Three differentbrands of 'liquidchlorine' are availablein themarketfor use in purifyingwater of swimmingpools. All are sold at the samerate of Rs 10 per litreand all are watersolutions. Brand A contains10%hypochlorite (CIO) (wt./vol.) brand B contains 7%availablechlorine (Cl) and brand Ccontains14% sodium hypochlorite(NaClO). Whichof thethree would you buy ?

Three differentbrands of 'liquidchlorine' are availablein themarketfor

1.	Three differentbrands of 'liquidchlorine' are availablein themarketfor use in purifyingwater of swimmingpools. All are sold at the samerate of Rs 10 per litreand all are watersolutions. Brand A contains10%hypochlorite (CIO) (wt./vol.) brand B contains 7%availablechlorine (Cl) and brand Ccontains14% sodium hypochlorite(NaClO). Whichof thethree would you buy ?
Answer» Solution :LET each of the solutions be 100 ml. Thenfor brand A,wt. of CIO = 10 g for brand B,wt. of Cl = 7 g for brand C, wt. of NaCIO = 14 g Let us now calculate wt. of Cl in each brand (i) Moles of Cl in CIOin brand `A = 1 XX` moles of CIO `= 1 xx (10)/( 51.5) ""(CIO = 51.5)` Wt. of CI in brand `A = (10)/( 51.5) xx 35.5 = 6.89 g` (ii) Wt. of Cl in brand B = 7 g (given) (iii) Moles of Cl in NaClO IN BRAND `C = 1xx ` molesof NaCiO `= 1 xx (14)/(74.5) ""(NaClO= 74.5)` Wt. of Cl in brand`C = (14)/( 74.5) xx 35.5 = 6.67 g` As brand Bcontains the highest WEIGHT of Cl, it should be bought, being thecheapest .