Titration

Question 1

The student rinses the burette with deionised water before filling with NaOH solution. State and explain the effect, if any, that this rinsing will have on the value of the titre 2M

Answer 1

Titre value would increase
Because NaOH solution would be more dilute

Question 2

The student used a wash bottle containing deionised water when approaching the end-point to rinse the inside of the conical flask. Explain why this improved the accuracy of the titration 1M

Answer 2

Idea that it ensures all ethanedioic acid / acid / sodium hydroxide / alkali / reactants are in the mixture / solution / reaction or the idea that some of the ethanedioic acid / acid / sodium hydroxide / alkali / reactants would be on the sides of the flask

Question 3

Describe the method, including apparatus and practical details, that the student should use to prepare the solution 6M

Answer 3

Weigh the sample bottle containing the solid on a 2dp balance
Transfer to beaker and reweigh the sample bottle
Record the difference in mass

Add deionised water
Stir with a glass rod
Until all of the solid has dissolved

Transfer to volumetric flask
With washings
Make up to 250cm3
Shake/invert/mix