Multiple Choice
Which statement best describes the pH scale?
17. Acid and Base Equilibrium
The pH Scale
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Which of the following solutions will have the lowest concentration of hydronium ions?
A
0.100 moles C6H5NH2
B
0.100 moles Be(OH)2
C
0.100 moles SrH2
D
0.100 moles (CH3)2NH
Verified step by step guidance1
Identify the nature of each compound: C6H5NH2 (aniline) and (CH3)2NH (dimethylamine) are weak bases, Be(OH)2 (beryllium hydroxide) is a strong base, and SrH2 (strontium hydride) is a strong base that reacts with water to produce hydroxide ions.
Understand the dissociation in water: Weak bases like C6H5NH2 and (CH3)2NH partially accept protons from water, producing fewer hydroxide ions compared to strong bases. Be(OH)2 dissociates completely in water to produce hydroxide ions.
Consider the reaction of SrH2 with water: SrH2 reacts with water to form Sr(OH)2, which dissociates completely to produce hydroxide ions, increasing the pH and decreasing the concentration of hydronium ions.
Compare the effect on hydronium ion concentration: Strong bases like Be(OH)2 and SrH2 will significantly decrease the concentration of hydronium ions compared to weak bases.
Determine the solution with the lowest hydronium ion concentration: Since SrH2 produces a strong base (Sr(OH)2) upon reaction with water, it will result in the lowest concentration of hydronium ions among the given options.
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