calculating purity of TCCA from active chlorine %

[psyloxy]

I think I need some help here.

Problem to be solved: I want to know the purity of a trichloroisocyanuric acid based pool chemical. The percentage of active chlorine is stated as 90-92%.

After my preliminary calculations it seems this product should be like 98% TCCA. Maybe what I try is impossible, but anyway here's my calculations:

M(TCCA) = 232.4094 g/mol

TCCA + 3 HCl ^__> isocyanuric acid (?) + 3 Cl₂

m(3 Cl₂) = 212.718 g

212.718 g / 232.4094 g = 0,9152 = 91,52 %


So, is the TCCA pure or am I way off here in my reasoning ?

--psyloxy--

[yei]

chlorine % means how much chlorinating activity the compund has compared to an equal mass of chlorine.

Since chlorine wastes 1/2 of itself in chlorination ( Cl2 + RH --> RCl + HCl ), even though TCCA has less chlorine, it has almost equal chlorinating power by weight.

So, it seems you calculated right to me ^^