Multiple choice

Direction: Ion concentrations obtained for a groundwater sample (having pH = 8.1) are given below.

           
Ion Ca2+ Mg2+ Na+ $HCO_3^-$ $SO_4^{2-}$ Cl–
Ion

concentration (mg/L)| 100| 6| 15| 250| 45| 39| | Atomic Weight| Ca = 40| Mg = 24| Na = 23| H = 1, C = 12, O = 16| S = 32, O = 16| Cl = 35.5|

Total hardness (mg/L as CaCO3) present in the above water sample is

  1. 205

  2. 250

  3. 275

  4. 308
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

 

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