One contains baking soda(sodium bicarbonate) and another potassium chloride. How

Question

One contains baking soda(sodium bicarbonate) and another potassium chloride. How would you identify these two chemicals by using reaction as done in lab. You should know chemical formulas of these two compounds. a) Initial reactions of both with conc H_2O_4. Describe the reaction of each. b) Show confirmatory reactions of each chemical by giving chemical reaction for each and explain how will you identify each bottle. You are given two bottles without label. One contains baking soda(sodium bicarbonate) and another potassium chloride. How would you identify these two chemicals by using reaction as done in lab. You should know chemical formulas of these two compounds. a) Initial reactions of both with conc H_2O_4. Describe the reaction of each. b) Show confirmatory reactions of each chemical by giving chemical reaction for each and explain how will you identify each bottle.

Explanation / Answer

Q2a

NaHCO3 and KCl

For Kcl --> use flame test, if flame is violet, then there is K+ presence

for NaHCO3, this is a base in solution, so if pH >7, then there is presence of NAHCO3

b)

confirmation reaction

KCl + HClO4 --> KClO4(s), precipitate is visible

NaHCO3 + HCl --> NaCl + H2O + CO2(g) gas formation is visible

Q3

MgSO4 and NaCl

addition of H2SO4:

MgSO4 --> Mg+2 + SO4-2

NaCl --> Na+

for flame test --> Na will turn red/orange

MgSO4 --> add OH- ions so Mg(OH)2 precipaites

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