Dilute them 2 times by 2 ml of the mixed solution with 6 ml of distilled water, then measuring the ph and 7.05 respectively, 6.77. From the trials conclude that when the next to holes to make the ph value measured is increased.
Then, the second time by 2 ml of the diluted solution is mixed with 18 ml of distilled water and then measuring the ph was 6.77 and 7.05, respectively, from the trial period. When the root continue ph-measured increases.