Multiple choice

Direction: Following chemical species were reported for water sample from a well:

 
Specials Concentration (milli equivalent/L)
Choride (Cl) 15
Sulphate (SO42–) 15
Carbonate (CO32–) 05
Bicarbonate (HCO3) 30
Cacium (Ca2+) 12
Magnesium (Mg2+) 18
pH 8.5

Alkalinity present in the water in mg/L as CaCO3 is

  1. 250

  2. 1500

  3. 1750

  4. 5000

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

 $\text{Alkalinity = Due to bicarbonate and carbonate only}\\ \hspace{1.9cm} = (30 + 5) \times 50 = 1750 mg/L \hspace{0.2cm} \text{as} \hspace{0.2cm}CaCO_3$