21. When determining the concentration of a hydrochloric acid solution, the student allowed a systematic error: -0.15 ml when taking an aliquot of 0.1000 M sodium carbonate solution with a 10.00 ml pipette. Find the absolute and relative errors in determining the concentration of a hydrochloric acid solution if 9.50 ml of titrant was needed to titrate an aliquot of sodium carbonate solution.
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