Essay On Titration Between Acid And Sodium Hydroxide

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Hydrochloric acid and sodium hydroxide were titrated into 50ml of water separately. By referring to table one and two, we can see the recorded pH changes when hydrochloric acid and sodium hydroxide were added respectively. By combining these results, graph one was formulated. This graph representing the titration curve of hydrochloric acid and sodium hydroxide. By referring to this graph it can be observed that the equivalence point is roughly at 7. Below is what would be expected of a similar experiment: Figure 1
(Chemguide.co.uk)
By comparing figure one to graph one, it can be concluded that the general curve of the graphs are quite similar. Also, in graph one it was noted that the equivalence point was about 7, this also what is shown
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Similarly, sodium hydroxide was titrated into a buffer solution of acetic acetate. The change of pH was recorded in table four. Again, these tables were combined to form graph two, showing the titration of hydrochloric acid and sodium hydroxide with a buffer solution.
By comparing graph one and two we are able to observe the effects of a buffer solution. As when a buffer is working effectively in a solution, it is resisting the change in pH when small quantities of acid or alkali are added. A buffer solution achieves this result by containing things which will remove any hydrogen ions or hydroxide ions that have been added. (Chemguide.co.uk) (Answer to question 2). Therefore by comparing the two graphs and examining the titration curve of graph two, we can conclude that the buffer is working effectively of the pH range of approximately 2-6pH (answer to question
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What is the ratio of acid to base required for a buffer solution of pH 5.76 using sodium acetate and acetic acid?

Therefore the acid to base ratio is 10:1.
Question 5. You are provided with stock solutions of acetic acid (0.1 mol.L-1) and sodium acetate (0.1 mol.L-1). Describe briefly (showing all calculations) how you would prepare 200 mL of buffer solutions of (i) pH 4.76 and (ii) pH 5.76.

Therefore there is a 1:1 ratio, therefore to make 200ml, 100ml would be needed to be combined in a volumetric flask to create 200ml of solution.

Therefore the ratio is 1:10, therefore to make 200ml, 10ml of sodium acetate and 180ml of acetic acid would be combined in a volumetric

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