Question

a zeolite softener was used to remove the hardness of 90000 litres of hard water completely the software required 450 litres of nacl solution containing 16 gram per litre of nacl for regeneration what is the hardness of water in ppm.
A. 4.79
B. 6.83
C. 7.55
D. 5.88

Answer 1

Answer:

B

Explanation:

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Answer 2

The Hardness of water in 6.83 mg/l or ppm.

Explanation:

• Given a zeolite softener was used to remove the hardness of 90000 litres of hard water
• 450 litres of nacl solution containing 16 gram per litre of nacl for regeneration

1 litre of $NaCl$ Solution = 16 gm of $NaCl$

450 litres of $NaCl$ =16× 450 gm of NaCl

                               =$7200 gm NaCl$

Quantity of $NaCl$ in terms of  $CaCO3$ equivalent hardness

= $7200$ ×$\frac{5}{58.5}$

=615.38 gm of $CaCO3$ equivalent

=$615.38$gm of $CaCO3$ equivalent

Hardness of 90000 litres =$615.38$×$10^{6}$

Hardness of1 litre 615.38×10⁶ mg/litre

The Hardness of 1 litre= 615.38×10⁶/90000

The Hardness of water=6.83 mg/l or ppm