Multiple Choice
Given the solubility product constant K_sp for Mg(OH)_2 is 1.8 × 10^{-11}, what is the molar solubility of Mg(OH)_2 in a 0.202 M solution of Mg(NO_3)_2?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
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Which of the following substances will most likely ionize completely when dissolved in water?
A
HBr
B
KCl
C
CaBr2
D
MgCl2
Verified step by step guidance1
Understand that substances that ionize completely in water are strong electrolytes, typically strong acids, strong bases, or soluble ionic salts.
Identify the nature of each substance: HBr is a strong acid, while KCl, CaBr2, and MgCl2 are ionic salts.
Recall that strong acids like HBr dissociate completely into ions in aqueous solution, for example: $\text{HBr} \rightarrow \text{H}^+ + \text{Br}^-$.
Recognize that ionic salts such as KCl, CaBr2, and MgCl2 also dissociate into their respective ions, but their degree of ionization depends on their solubility and strength as electrolytes.
Compare the substances and conclude that HBr, being a strong acid, will ionize completely in water, whereas the salts may dissociate but are not classified as ionizing completely in the same sense as strong acids.
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