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This information enables the subsequent iterations to be carried out more quickly. 6. Why is more than one accurate titration carried out? – TO minimize error by getting accurate readings within 0. 1-3 CM of each other. 7. Explain why hydrochloric acid is not used as a primary standard? – The exact concentration of any hydrochloric acid solution is not known, unless it is prepared from standard ampoules. Laboratory grade hydrochloric acid is not sufficiently pure. 8 Can any of the following be used as primary standards: Noah, HASPS, HON.?
Explain your answer. – A primary standard should be available in a highly pure state and stable. None of these substances are available pure because: (a) Noah readily absorbs water and carbon dioxide trot the air. (b) Concentrated HASPS readily absorbs water from the air, (c)HON. breaks down releasing NO? Gas, g, If you used only Comic of sodium carbonate solution in the conical flask, calculate how much acid would be required to neutralist it, I CACM An CO 3 solution used at concentration of 0. 1 M 1 x 10-3 moles Niacin 2 x 10-3 moles HCI required
Concentration of HCI is 0. 23 M 1000 x 2 x 10-3 / 0. CACM required II_CM fix. 10. Describe briefly how a pure dry sample of sodium chloride could be obtained having carried out the titration? – Using the information provided by the titration results, add just enough hydrochloric acid to exactly neutralist CACM 3 of sodium carbonate. The indicator should not be added. Gently heat the solution until all the water has evaporated to dryness.