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.

When 100 ml of a tube-well water is titrated using methyl orange as indicator, it requires 15 ml of 0.01 (N) HCl. Estimate the hardness. Of that sample of water.

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.

A 100 mL of tap water was titrated with M//50 HCl with methyle orange as indicator. If 30 mL of HCl were required. Calculate the hardness of CaCO_(3) per 10^(3) parts of water. The hardness is temporary.

100 mL of tap water containing Ca(HCO_3)_2 was titrated with N/50 HCl with methyl orange as indicator. If 30 mL of HCl were required, calculate the temporary hardness as parts of CaCO_3 per 10^6 parts of water.

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