TEST $2\_1$

Exercise

A water sample at $25C$ presents:

$A_p=0m\frac{g}{L}CaC{O}_3$

$A_{4t}=200m\frac{g}{L}CaC{O}_3$

$H_{\text{t}\text{o}\text{t}}=250m\frac{g}{L}CaC{O}_3$

$[M{g}^{2+}]=18m\frac{g}{L}$

$C_T=8$mmo$\frac{l}{L}$

Calculate:

$pH$

Acidity

Langelier's stability index by specifying if the water is stable, aggressive or scale forming

calcium carbonate hardness and calcium non$-$carbonate hardness

$K_1^{**}=4*47*{10}^{-7}$

$K_2=4*7*{10}^{-11}$

$K_{sc}={10}^{-8}$

Atomic weight: $H=1,O=16,Ca=40,Mg=24,C=12,Cl=35\mathrm{.}45,S=32$