Part 3. Write equilibrium equations for any ionization or hydroylsis happening with the two salts you looked at (there should be a total of 4 equations). Discussion:Dihydrogen phosphate ion and monohydrogen phosphate ion are both amphiprotic. Explain what the word amphiprotic means. Explain why NaH2PO4 is acidic and Na2HPO4 is basic. Justify your answer using K values.
Part 3. Write equilibrium equations for any ionization or hydroylsis happening with the two salts you looked at (there should be a total of 4 equations). Discussion:Dihydrogen phosphate ion and monohydrogen phosphate ion are both amphiprotic. Explain what the word amphiprotic means. Explain why NaH2PO4 is acidic and Na2HPO4 is basic. Justify your answer using K values.
Part 4. In this section you are investigating how baking powder works. Do some research online or in the library about baking powder. Write a few paragraphs, using complete sentences and any appropriate equilibrium equations (use net ionic equations!), describing the chemistry of baking powder. Be sure to relate this to your experimental results. Your discussion should include answers to the questions- what are the active ingredients in baking powder and why are they there? Why are solutions of aluminum salts acidic?, what does baking powder have to do with hydrolysis? why do they put aluminum salts in baking powder?, what were the bubbles you saw in lab and why are they important in cooking? how do aluminum salts help the bubbles to form?
Data and procedure:
Part 1. Using a pH meter, measure the pH of the following 5 salt solutions (use the solutions that are labeled "Experiment 3"): 1 M NaC2H3O2 , 1 M NaCl, 1 M NH4Cl, 1 M NH4C2H3O2, 1 M Na2CO3 .Part 2. Go to the reagent shelves and find the containers of solid ammonium chloride, ammonium acetate, and ammonium carbonate. Open the containers and cautiously smell. Rank the three solids in terms of the strength of the ammonia odor. Part 3. Using a pH meter, measure the pH of 0.1 M NaH2PO4 (sodium dihydrogen phosphate) and 0.1 M Na2HPO4 (sodium monohydrogen phosphate).Part 4. Weigh out about 2 grams of solid aluminum sulfate (since this is an approximate mass, use the centigram balance, do not use the analytical balance) in a 50 mL beaker. Add about 10 mL of water and mix thoroughly with a stirring rod. Measure the pH of the solution.Into another 50 mL beaker, weigh out about 2 grams of solid sodium bicarbonate. Add about 10 mL of water and mix thoroughly. Measure the pH of the solution.Now mix these two solutions together in a larger beaker. Note any observations.
Data:
Data:
Part 1
1M of:
NaCH3CO2 ph=8.79
NaCl ph = 6.89
NH4Cl ph=5.06
NH4CH3CO2 ph = 6.90
Na2CO3 ph=11.82
Part 2
NH4Cl(s) - smell weak
NH4CH3CO2 (s)- smell medium
(NH4)2CO3(s)- smell strong
Part 3
0.1 M NaH2PO4 ph=8.56
0.1 M Na2HPO4 ph=4.65
Part 4
2g of Al2(SO4) (s) + 10 ml H2O (50 ml beaker)
ph = 7.96
2g NaHCO3(s) + 10 ml H2O (50 ml beaker)
ph = 3.07
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