2. (12 points ? 2 pts for each reaction and I Pt for acidic/basic/neutral As a f

Question

2. (12 points ? 2 pts for each reaction and I Pt for acidic/basic/neutral As a first step, write the dissociation reaction that occurs when a salt is first added to water, Second. write the hydrolysis reactions that occur when each of the following salts is added co water (treat the cation and anion hydrolysis (or not) as separate reactions) and predict whether the resulting solutions will be acidic, basic, or neutral If there is no reaction write ?no reaction? KBr Al(NO3)3 Na2SO3 3. (3 points) Water in contact with the atmosphere is always slightly acidic, rather than neutral. Explain why. Write a balanced chemical equation. 4. (2 points) Consider the indicator tests for the hypothetical salt that as shown during the CH229 lab lecture. What indicator was used? Estimate the pH of the solution.

Explanation / Answer

2. For KBr

Dissociation: KBr -> K+ + Br -

Hydrolisis: KBr + H2O -> K+ + Br - + H+ + OH- -> KOH + HBr

pH: 7, neutral

For Al(NO3)3

Dissociation: Al(NO3)3 -> Al+3 + 3(NO3)-

Hydrolisis: Only the aluminum ions will be hydrated, causing a decrease in pH, making it an acidic solution. No reaction

For Na2SO3

Dissociation: Na2SO3 -> Na+ + SO3-2

Hydrolisis: Na2SO3 + H2O -> NaOH + H2SO3

Basic Ph

3. Water is slightly more acidic in the surface due to its contact with compounds in it such as CO2, SOx, and other greenhouse gases, which form acids:

CO2 + H2O -> H2CO3

SO3 + H2O -> H2SO4

4. I don't quite get what to do on the last question. I believe there's missing data.

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