Unknown Soda Ash Lab Report

The unknown soda ash from experiment 3 was used, to determine the weight for each trial we used the equation of (M of HCl) x (18 ml x 105.99) / (10 x 2 x Na2CO3 ). Which was equal to (0.01472 M) x ((18 mL X 105.99)(10 x 2 X 2.428 % )= 0.6 g. To start we had to rinse the beakers, electrode and the stirring bar with diluted water. The sample we needed was weighted to the closest 0.1 mg which we got was 0.3 for the first trial. The sample was transferred to a 250 mL beaker and dissolved in 70 mL of water. Then we needed to standardize the pH meter and electrode with pH 7 and pH 4 buffers.
For Trial 1, we had to titrate the base with the standardized HCl solution potentiometrically, which was prepared in experiment 3. The solution used needed