Answer to Question #166185 in Mechanical Engineering for Priti Khaire

Question #166185

50 ml of an alkaline water sample requires 10.4 ml of 0.05 N HCl upto phenolphthalein end point and total 14.3 ml of the acid for complete neutralization. Find types and amount of alkalinities in water.


1
Expert's answer
2021-03-01T02:14:44-0500

"V_b = 50ml\\\\\nV_a\\ (incomplete) = 10.4 ml \\\\\nC_a = 0.05 N = 0.05M\\\\\nV_a = 14.3ml"


The reaction is;

"HCl + xOH \\to H_2O + xCl"


During incomplete neutralisation, the phenolphthalein concentration is;


"\\dfrac{0.05 \u00d7 10.4 }{50} = C_b = 0.0104M"



However, during complete neutralisation, the final concentration of the alkali water is;


"\\dfrac{0.05 \u00d7 14.3 }{50} = C_b = 0.0143M"

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