by Yao Xuan Wang

Analysis of Pond Water for KOI fishes

yaoyao_wyx — 2015-01-24 06:25:47 UTC

Optimum Condition

yaoyao_wyx — 2015-01-24 06:26:10 UTC

pH: ideal 7.5, range from 6.8- 8.2 is okay

Methodology

yaoyao_wyx — 2015-01-24 06:28:15 UTC

EXPERIMENT; To find the pH of the pond water by titrating a suitable acid/base against the pond water.Firstly, we dipped a blue and red litmus paper into a small sample of pond water to check for its pH. The blue litmus paper turned red, so we concluded that the pond water is acidic. Then, the pipette was washed with deionizedwater, followed by pond water. We went on to wash the burette with NaOH, a suitable base. After the pipette was used to transfer pond water in to the beaker, we added in a suitable indicator, Bromothymol Blue. We started titration until there was a change in colour. The amount of NaOH used was noted down in a table. The experiment was then repeated two more times.

Results & Discussions

yaoyao_wyx — 2015-01-24 06:36:50 UTC

TITRATION

For every 10.0cm^3 of pond water, 3.3cm^3 of 1M NaOH was needed to cause a colour change from yellow to blue.

NaOH + H+ =Na+ + H2O

No. of mol NaOH = 0.0033 dm3 x 1.00 moldm-3 = 0.0033 mol

No. of mol H+ = 0.0033 mol

Conc. of H+ = 0.0033 mol / 0.01 dm-3 = 0.33 moldm-3

pH= -lg [H+] = -lg [0.33] = 0.48

We found out that the pH of the pond water to be 0.48.

After our calculations, we found out that our results are quite inaccurate. This could be due to some experimental errors.

Conclusion

yaoyao_wyx — 2015-01-24 06:37:06 UTC

The water is unsuitable for the breeding of KOI fishes

Aim: To determine the suitability of the pond water for breeding KOI fishes by checking for acidity of water

yaoyao_wyx — 2015-01-24 07:15:11 UTC