For this experiment we did three different titrations where we mixed the known s

Question

For this experiment we did three different titrations where we mixed the known solution the titrant with the unknown analyte to create a chemical reaction. To make the titrant we weigh out 1.489g of disodium EDTA needed to make the 250mL of 0.016M EDTA solution. Next we mixed 100mL of warm distilled water until the EDTA has dissolved. Then we added 9mL of 0.105 M MgCl_2 solution, and 2.8 mL of 3 M NH_4OH to the EDTA solution. For the analyte we obtain a calcium supplement tablet (Calcium and vitamin D3 supplement) and placed a total of 25mL of 3M HCL to it until it dissolved. Before we began with the titration we added 10mL of ammonia/ammonium chloride buffer solution to make the solution basic, and added 13 drops of indicator. Once the experiment began we titrated with the disodium EDTA from the buret until the last traces of red were gone and the solution became a pure blue color. The volumes of disodium EDTA solution were recorded in a table (Figure 1). What is the difference between a titration to determine calcium ion concentration and a titration between an acid and a base? Docs this comparison change if the acid/base?

Explanation / Answer

1. Titration between Calcium and EDTA is complexometric titration. In this titration complex is formed between Ca^2+ ion and EDTA. Acid-base titration is neutralization titration, in this titration acid reacts with base to produce water and salt.

In complexometric titration constant pH must be maintained for that buffer solution is used. But in acid base titration pH changes during the titration.

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