Water Sample And Ph Of Vinegar And Orange Juice

1457 Words Oct 27th, 2015 6 Pages
The water sample with the lowest pH was the Dhaka water sample, which had a pH of 2.52, making it the most acidic water. This was followed by Port River water, which had a pH of 4.6, Waterfall Gully water sample at 4.75, and Johnston 's Creek at 5.29 (refer to Table 1 and Figure 3). The Dhaka sample 's pH is between the acidity of vinegar and orange juice (ScienceBuddies, 2015).
Figure 3: Average pH/acidity of the water samples. Not all samples were titrated, as both Waterfall Gully and Johnston 's Creek are not acidic enough for the titration. The Dhaka (Bangladesh) water sample and Port River sample were titrated. Dhaka sample had an average titre volume of 11 mL of 0.01M NaOH, meanwhile, the Port River sample had a significantly smaller average titre volume of 0.3 mL (refer to Table 1 and Figure 4).
Figure 4: Average titre volume (mL) for the Port River and Dhaka samples, If bunker fuel is what is causing the acidity in the water, the likely acids the sodium hydroxide neutralised were sulphuric acid (H2SO4) and nitric acid (HNO3). The equations for the following reactions are:
H2SO4 (aq) + 2NaOH (aq) → 2H2O (aq) + Na2SO4 (aq)
HNO3 (aq) + NaOH (aq) → H2O (aq) + NaNO3 (aq)
Using the titre volume, the pH of the samples can be figures out. Refer to Appendix for calculations.
The concentration of acid in the Dhaka sample when assuming that the acid being neutralised is sulphuric acid is 0.00275 mol/L, and the pH is 2.56 (refer to Figure 3 and Table 2). The…
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