`100 mL` sample of distilled water, tap water and boiled water required, respectively, `2 mL,17 mL` and `7 mL` of soap solution to form permanent lather. The ratio of permanent to temprorary hardness in the tap water is

25 mL sample of distilled water, tap water and boiled water required, respectively, 1 mL,13 mL and 5 mL of soap solution to form permanent lather. The ratio of permanent to temprorary hardness in the tap water is

25mL samples of distiled water, tap water and boiled water required, respectively, 1mL, 13mL and 5mL of soap solution to form a permanent lather. The ratio of temporary to permanent hardness in the tap water is

25mL samples of distiled water, tap water and boiled water required, respectively, 1mL, 13mL and 5mL of soap solution to form a permanent lather. The ratio of temporary to permanent hardness in the tap water is

100 mL of a sample of tap water requires 50 mL of N // 50- HCl solution for titration. Calculate the temporary hardness of tap water.

10 mL of 0.01 (N) HCl is required for titrating 100 mL of a sample of cold water using methyl orange as indicator. Determine the temporary hardness of that sample of water.

50 ml of water sample requires 6 ml of soap solution to produce a good lather. 1 ml of soap solution is equal to 0.001 g of CaCO_3 . Then the degree of hardness of water is

A hard water sample contains magnesium bicarbonate only. 100 ml of the hard water sample requires 10 ml. of standard soap solution (1 ml soap solution = 1 mg CaCO_3 ) to get good lather. Find out of the weight of Ca(OH_2) to be added to 10 Kg water sample to make it soft water.

1 ml of 1 M solution is mixed with 999 ml of pure water.