Question

vom voline SE 5: Buffers o n test effect of acid and bases on the carbonic acid/sodium bicarbonate buffer system. ere will test et ou will need: 4 small beakers balance IM NaOH pH paper baking soda glass stirring rod 100 ml beaker seltzer water graduated cylinder IMHCI Prepare 50 mL of a butter containing 0.1M NaHCO. in carbonic acid. Use a source NaHCO, and seltzer water as a source of carbonic acid How much NaHCO, is needed? 6.4 baking soda a 2. Label 4 clean beakers: water A, buffer A, water B and buffer B. Add 20 ml of water to the beakers marked-water A and water B. Test the initial pH of the water and record in the table provided. Add 20 ml of the NaCo. buffer vou mixed in step I to the two beakers marked butter A and buffer B. Test the initial pH of the buffer and record in the table below. 5. Test the pH of ... IM NaOH pH = a IM HCI pH- 6. Add drops of acid (IM HCI) to the beakers marked Water A and Buffer A according to the chart below. Mix well after each drop and record the pH in the table below. Add drops of base (1 M NaOH) to the beakers marked Water B and Buffer B according to the chart below. Mix well after each drop and record the pH in the table below. Beaker PH Water A 1MHCl Number of Drops added to Beaker INITIAL ADDITION 1 2 3 4 5 6 7 8 9 pH pH pH | pH pH pH pH pH pH pH 1655 44 13/2/21 IM HCI T88/ 8888 IM NaOH 9 10 10 10 10 IM NaOH 8 8 8 8 8 8 8 8 8 9 Buffer A Water B Buffer B 7. Which test tubes showed the greatest change in pH?

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Answer 1

1. Amount of Natco needed = 50x100 1x 847/0.42gms. I 5.6H of im NaOH-114 because boh--log1=0,-.84-14-60H=14 pH of YM HCl = [0] because plterlop Pro 7. Beaker Initial pt a Water A & Water BB showed the Greatest Waton À 7 Change in pH. Buffer A 8 Because, Bulkers Resist the change in pH. Water B The function of a Buffer is to maintain the Buffer B lot at a constant level.