1. The density of vinegar was determined using a pycnometer. The empty pycnometer weighed 0.495g at 23¤celcius. Filled with vinegar, it weighed 0.800g. Filled with water it weighed 0.896g. The density of water at 23¤celsius is 0.9975g/cm3. A 0.825cm cube sample of NaOH was standardized using 0.815cm cube of 0.0969 M potassium hydrogen phthalate (KHP). The standardized solution was then used to titrate 0.250cm3 of the vinegar. The volume of NaOH needed was 2.205cm3.
The stoichiometry of the reaction is C2H4.O2(aq) +Na.OH(aq) = Na(aq) + C2H3O2(aq) + H2O(l).
(i). Calculate the density of the vinegar.
(ii). Find the concentration of acetic acid in the vinegar in moles per litre, grams per litre and percent by weight.
2. What amount of oxalic acid (H2C2.O4.2H2O, MW=126.0g/mol) is required to prepare 10cm3 of 0.130 M oxalic acid solution?
1 Answers Available
Asked by Moses Idorenyin
on 14th March, 2019
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