Mainn T.

asked • 03/23/18

Buffer experiment


20 ml of sodium acetate( buffer ) was poured into beaker 1, and 20 ml of distilled water was poured into beaker 2. BTB indicator was added to both beakers. The color and pH were observed. The beaker containing sodium acetate turned yellow and had a pH of 3. The beaker containing distilled water turned green and had a pH of 7. Then two drops of diluted hydrochloric acid was added to both beakers. The beaker containing sodium acetate remained yellow and had a pH of 3. The beaker containing distilled turned yellow and had a pH of 3.

Questions:

Before HCl was added to the sodium acetate solution, the color was yellow and the pH was 3, when hydrochloric acid was added to the beaker containing containing sodium acetate, the solution resisted change in color ( yellow ) and pH ( 3 ). Why.

Before HCl was added to the distilled water solution, the color was green and the pH was 7, when hydrochloric acid was added to the beaker containing distilled water, the solution changed color from green to yellow and its pH from 7 to 3. Why.

Write the reaction formula for the two solutions, showing what happened when the acid was added.

What’s the point of showing the reaction formulas?

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