6. Dissolve a sodium hydroxide pellet in a 100 cm3 volumetric flask.
20 cm3 of this solution are then neutralized with 0.1 molar hydrochloric acid using bromothymol blue as an indicator. The hydrochloric acid consumption is 16.5 ml. Determine the concentration of the sodium hydroxide solution and the mass of the sodium hydroxide pellet.
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Thus, a small amount of NaOH is dissolved in 100 ml of water and a 20 ml aliquot is titrated against a c=0.1 mol/l HCl. Consumption is V=16.5 ml.
Thus, n=cV=1.65 mmol of HCl was consumed, and the whole NaOH particle contained five times as much as 8.25 mmol of NaOH, i.e. m=nM=330 mg. However, it is not possible to derive from the fact that NaOH attracts H2 O and CO2 in the air and therefore becomes more and more difficult in the course of time, without increasing the amount of NaOH.
And so the titration curve would look:
P.S.: Fixed errors in the graphics.