A solution is made by dissolving 0.0890 moles of Ba(OH)2 in enough water to make 545 mL of solution. What is the pH of the resulting solution

The pH of this solution is 13.515

Explanation:

Step 1: Data given

Number of moles Ba(OH)2 = 0.0890 moles

Volume = 545 mL

Step 2: Calculate moles OH

Ba(OH)2 → Ba^2+ + 2OH-

In 1 moles Ba(OH)2 we have 2 moles OH-

In 0.0890 moles Ba(OH)2 we have 2*0.0890 = 0.178 moles OH-

Step 3: Calculate concentration of OH-

[OH-] = moles / volume

[OH-] = 0.178 moles / 0.545 L

[OH-] = 0.327 M

Step 4: Calculate pOH

pOH = -log[OH-]

pOH = -log(0.327)

pOH = 0.485

Step 5: Calculate pH

pH + pOH = 14

pH = 14 - pOH

pH = 14 - 0.485

pH = 13.515

The pH of this solution is 13.515

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.