Identify the following salts as neutral, acidic, or basic. Drag each item to the appropriate bin. 1. LiF
2. SrBr2
3. NH4CN
4. NH4Br
5. KCN
6. NH4ClO4
7. LiNO3
A. Neutral salts.
B. Acidic salts.
C. Basic salts.

A. Neutral salts.  (7, 2)

B. Acidic salts.  (4, 6)

C. Basic salts. (1, 3, 5)

Explanation:

We must know where, do the ions come from. If they come from a weak acid or base, they can make hydrolysis in water, so OH⁻ and H⁺ are given to medium.

1. LiF → Li⁺ + F⁻

F⁻  +  H₂O  ⇄  HF + OH⁻

F⁻ can make the hydrolysis, and it gives OH⁻. Salt is basic.

2. SrBr₂ → Sr²⁺  + 2Br⁻

Both are weak and they can not hydrolyse. This salt is neutral.

3. NH₄CN →  NH₄⁺  + CN⁻

Both ions are strong, so they can make the hydrolysis. The thing is, while the ammonium gives protons, the cyanide give hydroxides. To determine how's the salt, we need to compare the Ka and Kb.

NH₄⁺  +  H₂O ⇄  NH₃  +  H₃O⁺   Ka = 5.7×10⁻¹⁰

CN⁻  + H₂O ⇄  HCN  +  OH⁻     Kb = 1.61×10⁻⁵

As  Kb > Ka, pH is basic.

If Ka > Kb, pH would be acidic.

4. NH₄Br →  NH₄  + Br⁻

Br⁻ does not hydrolize. The ammonium cation, reacts in water to give protons to medium that's why the salt will be acidic.

NH₄⁺  +  H₂O ⇄  NH₃  +  H₃O⁺   Ka

5.  KCN →  K⁺  + CN⁻

K⁺ does not hydrolize. The cyanide anion, reacts in water to give hydroxides to medium that's why the salt will be basic.

CN⁻  + H₂O ⇄  HCN  +  OH⁻     Kb

6. NH₄ClO₄ →  NH₄⁺  + ClO₄⁻

ClO₄⁻ comes from the perchlroric acid (a strong acid). It does not hydrolyze

NH₄⁺  +  H₂O ⇄  NH₃  +  H₃O⁺   Ka

Ammonium gives H⁺ to medium so the salt is acidic.

7. LiNO₃ → Li⁺  + NO₃⁻

Both ions does not make hydrolysis. They come from a strong base and a strong acid, so they are the conjugate weak acid and base, respectively.

The salt in this case, will be neutral.

put the answers   and i could answer.

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.