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Tracking Neutralization as a Solid Dissolves 4 questions
Tracking Neutralization as a Solid Dissolves
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A classroom model contains dissolved hydroxide and some solid that can supply more hydroxide as it dissolves. Each mole of OH- neutralizes one mole of H+. In this model the already dissolved hydroxide reacts first. A rinse initially supplies 0.006 mol H+. Assume the two portions of solid fully dissolve at the stages shown.
| Source of hydroxide | Amount made available (mol) |
|---|---|
| Already dissolved | 0.004 |
| First portion that later dissolves | 0.003 |
| Second portion that later dissolves | 0.003 |
Question 1
How much H⁺ remains just after the already dissolved hydroxide reacts?
- 0.002 mol
- 0.003 mol
- 0.004 mol
- 0.006 mol
Question 2
After the first solid portion dissolves, state which ion is now in excess and find its amount.
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Question 3
A student says the mixture cannot neutralize the rinse because it initially contains only 0.004 mol dissolved hydroxide. Evaluate the claim.
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The model repeats the test after removing the undissolved solid from a fresh mixture. Assume removing it does not change the original 0.004 mol of dissolved hydroxide.
Question 4
Compare which ion remains in excess after all available hydroxide reacts in the unfiltered and filtered trials.
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