`320mg` of sample of magnesium having a coating of its oxide required `20mL` of `0.1M` hydrochloric acid for the complete neutralisation of the latter. The composition of the sample is :

320 mg of a sample of magnessium having a coasting of its oxide required 20mL of 0.1M hydrochloric acid for the complete neutralisation of the latter. The composition of the sample is:

0.126 g of acid required 20 mL of 0.1 N NaOH for complete neutralisation. The equivalent mass of an acid is

0.16 g of dibasic acid required 25 ml of decinormal NaOH solution for complete neutralisation. The molecular weight of the acid will be

0.075 g of a monobasic acid required 10 mL of N//12 NaOH solution for complete neutralisation. Calculate the molecular mass of the acid

2.36 g of sample of dolomite containing only CaCO_(3) and MgCO_(3) were dissolved in 700 mL of 0.1 N HCl . The solution was dilutied to 2.05 L . 25 mL of this solution required 20 mL of 0.01 N NaOH solution for complete neutralisation. Find the percent composition of ore.

In the estimation of nitrogen by Kjeldahl's method 2.8 gm of an organic compound required 20 millimole of H_2SO_4 for the complete neutralisation of NH_3 gas evolved. The percentage of nitrogen in the sample is:

50 ml of water sample, containing temporary hardness only, required 0.1 ml of M/50 HCl for complete neutralisation. Calculate the temporary hardness of water in ppm.

A 2.0 g sample of a mixture containing sodium carbonate, sodium bicarbonate and sodium sulphate is gently heated till the evolution of CO_(2) ceases. The volume of CO_(2) at 750mm Hg pressure and at 298 K is measured to be 123.9 mL . A 1.5 g of the same sample requires 150 mL of (M//10) HCl for complete neutralisation. Calculate the percentage composition of the components of the mixture.

0.16 gm of a dibasic organic acid required 25.0 ml of (N)/(10)NaOH for complete neutralisation. Calculate its molucular mass.

The ammonia evolved from the treatment of 0.30 g of an organic compound for the estimation of nitrogen was passed in 100 mL of 0.1 M sulphuric acid. The excess of acid required 20 mL of 0.5 M sodium hydroxide solution for complete neutralisation. The organic compound is: acetamide benzamide urea thiourea