Unknown number Molarity of sodium hydroxide solution Titrations Mass of flask- a

Question

Unknown number Molarity of sodium hydroxide solution Titrations Mass of flask- and Mass of flask Mass of unknown Final buret reading Initial buret reading Volume of NaOH soln. Moles of unknown acid (assume monoprotic) Molecular mass of acid Average molecular mass of acid Deviation of each mol, mass from average Average deviation of molecular mass Suggest experimental modifications you could make if the acid to be titrated has low solubility in water. Some of the Learning objectives of this experiment are listed on the first page of this experiment. Did you achieve the Learning objectives? Explain your answer.

Explanation / Answer

Question 12.

Average MM = (MW1+MW2+MW3)/· = (190.5 + 277.3 + 523.2)/3 = 330.333 g/mol

Q13.

Deviation

(190.5 - 330.333 ) /330.333 = -0.4233 = -0.4233^2 =0.1791

(277.3 - 330.333 ) /330.333 = -0.160544 = (-0.160544)^2 = 0.02577

(523.2 - 330.333 ) /330.333 = 0.5838 = 0.5838*2 = = 0.3408

Total Deviation = 0.1791+0.02577+0.3408 = 0.54567

Q15.

If acid has low solubility:

Saturate solution

Try multiple samples

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