Question

50 ml of alkaline water sample requires 5.2 ml of N/50 HCI upto
phenolphthalein end point and 15.4 ml for complete neutralization. Find
types of alkalinity?
P= 104 ppm & M= 308 ppm
P= 1040 ppm & M= 3080 ppm
P= 308 ppm & M = 104 ppm
P= 104 ppm & M= 204 ppm

Answer 1

$\rm\huge\underline{Answer}$

the branch of science concerned with the substances of which matter is composed, the investigation of their properties and reactions, and the use of such reactions to form new substances.

Answer 2

Option (a)  P= 104 ppm & M= 308 ppm is the value of alkaliiy as calculated.

Explanation:

• Alkalinity is determined by using the acid-base indicator phenolphthalein and methyl orange indicator.
• We titrate the acid and base using these two indicators and measure the phenolphthalein and methyl orange indicator P and M respectively

Different cases of alkalinity are

Condition Hydroxide Carbonate Bicarbonate

P = 0               None           None              M

P = M                M           None              None

P = 1/2 M              None            M                      None

P < 1/2 M              None            2P              M – 2P

P > 1/2 M             2P – M   2(M – P)      None

Here the value of P =5.2ml and M =15.4 ml so

P < 1/2 M   None            2P     M – 2P so Carbonate and bicarbonate.

and the correct answer is Option (a)