Chemistry Practical Experience study note, Exams of Physics

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UNIT SCH 2100: INORGANIC CHEMISTRY ONE. EXPERIMENT 1. VOLUMETRIC ANALYSIS, I lucti A quantitative analysis based upon the measurement of volume is called volumetric or titrimetric method. Volumetric methods are much more widely used than gravimetric methods because they are usually more rapid and convenient. In addition they are often as accurate. Procedure Weigh out accurately about 1.32 g of a substance which is a metal carbonate with the formula X2CO;into a 250 ml volumetric flask. Add about 100 ml of distilled water and stir until the crystals dissolve. Adjust the volume of the solution in the volumetric flask to the mark. Pipette 25 ml of this solution into a 250 ml conical flask. Add 2-3 drops of methyl Red indicator and titrate with a standard 0.1 hydrochloric acid. Repeat the titrations until the titres agree to 0.05 cm’. Record your results in a table. Calculations. (H=1.0 CL=35.5 C=12.0 0=16.0) (a)Write a balanced chemical equation for the reaction between hydrochloric acid and X,CO; carbonate solution. (b)(i) How many of the acid took part in the reaction? (ii) Hence calculate the molarity of the carbonate solution in moles/dm? (iii) Also calculate the concentration of the metal carbonate solution in g/dm’. (c)Calculate the relative formula mass (R.F.M) of the metal carbonate X2COs.