ROUGH TITRATION Mass of Na CO, in milligrams Volume of used in titration Buret r

Question

ROUGH TITRATION Mass of Na CO, in milligrams Volume of used in titration Buret reading at No. of millimoles of Na2CO3 Buret reading at start of titration end of titration NOTE: Na COs has molar mass 106.00 g/mol Ratio of milliliters dilute HCl to millimoles of Na2CO3 :-1. ACCURATE TITRATIONS ml HCI/mmol Na2COs TraTrTraisn Trial 1 Trial 2 Trial 3 (if needed) Mass of Na CO3 in milligrams Number of millimoles of Na2CO3 (sig.figs.l) mmo Buret reading at ?10.00mL | 0.10mL |7.34mL|IoAMm? 13 .30m-B :Tom. HC used in g.20mL 13.30mL 8.00mL start of titration 0.00m Predicted buret reading at end ofI7,18mL titration Actual buret reading at end of titration Volume of dilute l 8 .20 mL titration Molarity of dilute HCI solution

Explanation / Answer

Trial1 Trial 2 Trial 3 Mass of Na2CO3 in mg 95mg 97.4mg 92.2mg Number of mmol of Na2CO3 0.90mmol 0.92mmol 0.87mmol Actual volume of HCl required (V) 8.20mL 13.30mL 8.60mL Number of mmol of HCl required (m)(double of that of Na2CO3) 1.80mmol 1.84mmol 1.74mmol Molarity of HCl solution (m/V) 0.219M 0.138M 0.202M

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