Question

pre lab questions:

1. Define “acid” according to the Bronsted-Lowry theory of acids and bases.

2. Hypothesize what might occur to the sodium bicarbonate when it reacts in Part B of this experiment. What will you see?

3. The NaI might undergo one of two different reactions when it reacts with 18 M sulfuric acid in Part C of this experiment. Describe what happens in both of these possibilities (in words or with reaction equations)

4. Lookup the physical appearance of I₂ and Cl₂. What do they look like?

5. Hypothesize what might occur to the magnesium and copper metals when they react with HCl in Part D of this experiment.

Answer 1

Ans 1. According to Lowry Theroy, Acids are the substances which donate protons(H+) and bases are those which accepts protons.

examaple:- Acid:- HNO3 = H + + NO3-

Base:- NH3 + H+ = NH4+

Ans2. Sodium bicarbonate, is a salt and on dissociation it gives Na+ and HCO3-

HCO3- = H + + CO3^2-

NaoH = Na + OH-

_{and hence NaHCO3 is a salt of weak acid and strong base}

_{Ans 3. 2NaI + H2SO4 = Na2SO4 + 2HI}

_{NaI + H2SO4 = NaHSO4 + HI}

_{Ans 4. Cl2 is a gas and I2 is a solid in physical appearance. I2 is a solid due to strong vanderwaal force of attraction due to its large size.}

_{Ans 5. Mg + HCl = MgCl2 + H2}

   _{Cu + HCl = No reaction because reduction potential value for Cu is greater than Hydrogen.}