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Chapter 21: Problem 16

Which has the (a) higher melting point, MgO or BaO; (b) greater solubility in water, \(\mathrm{MgF}_{2}\) or \(\mathrm{MgCl}_{2}\) ? Explain.

Short Answer

Expert verified
(a) MgO has a higher melting point than BaO. (b) \(\mathrm{MgCl}_{2}\) is more soluble in water than \(\mathrm{MgF}_{2}\).

Step by step solution

01

Identify the relative atomic sizes

Identify that Magnesium (Mg) is higher up on the Periodic Table compared to Barium (Ba), which makes Mg smaller in atomic size than Ba.
02

Predict Melting Points based on Trends

Recognize from the Periodic Table trend that as you go down the group (from Mg to Ba), atomic size increases and thus the forces between the ions become weaker. This leads to a decrease in melting points.
03

Check Solubility Rules

Know that general solubility rules state that salts of fluorides are less soluble than salts of chlorides in water.
04

Predict Solubility

Considering the aforementioned rules, conclude that \(\mathrm{MgF}_{2}\) is less soluble than \(\mathrm{MgCl}_{2}\) in water.

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Most popular questions from this chapter

The reaction of borax, calcium fluoride, and concentrated sulfuric acid yields sodium hydrogen sulfate, calcium sulfate, water, and boron trifluoride as products. Write a balanced equation for this reaction.

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