How is Removing Magnesium from Ceramic Rinsewater structured on New Regents?

Use a precipitation model and measured results to balance ions and compare treatment trials. Every question is worth 1 raw credit and pairs with the 2025 Edition Reference Tables, automatic multiple-choice key checking, and step-by-step constructed-response scoring guidance.

Can I practice one phenomenon cluster at a time or sit the full exam?

Yes. In the New Regents workspace you can launch any individual 4–6 question cluster in Learn mode (with strategy prompts) or sit the complete examination in Exam mode, then review every answer against the official-style scoring guide.

Removing Magnesium from Ceramic Rinsewater with Answers (Free PDF)

6 original questions from New Regents. The worksheet, answer key, and browser practice are free.

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Removing Magnesium from Ceramic Rinsewater 6 questions

Removing Magnesium from Ceramic Rinsewater

Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.

A ceramics class studies a simplified rinsewater model containing dissolved Mg²⁺ and Cl^-. When hydroxide ions are added, Mg²⁺ and OH^- can form solid Mg(OH)₂. The class separates this solid from the water by filtration. In the model, chloride ions stay dissolved. Each 1.00 L starting sample contains 0.0040 mol of dissolved Mg²⁺.

Mg²⁺(aq) + 2OH^-(aq) → Mg(OH)₂(s)

Question 1

Which observation is consistent with chloride acting as a spectator ion in this model?

Cl⁻ remains dissolved as Mg(OH)₂ forms.
Cl⁻ becomes part of solid Mg(OH)₂.
Cl⁻ is converted to neutral chlorine atoms as the solid forms.
Cl⁻ replaces all the hydroxide ions in the solid.

Question 2

Use the net equation to calculate the minimum amount of OH⁻ needed to react with all 0.0040 mol of Mg²⁺ in the ideal model. Show the mole ratio.

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Question 3

Show how the charges of the ions in the net equation account for the neutral formula Mg(OH)₂.

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Comparing the filtered samples

After filtration, the class measures the dissolved magnesium and pH in three model trials. Their assignment requires a final dissolved magnesium concentration of at most 10 mg/L and a pH no higher than 10.5. These are classroom model constraints.

Trial	OH^- added (mol)	Dissolved magnesium (mg/L)	Final pH
P	0.0060	25	9.9
Q	0.0080	3.0	10.3
R	0.0100	0.04	11.3

Question 4

Which trial meets both classroom model constraints?

P only
Q only
R only
Q and R

Question 5

A 0.500 L portion of Q’s filtered sample is poured into a clean container. Calculate the mass of dissolved magnesium in that portion.

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Question 6

A student concludes that the trial with the least dissolved magnesium is the best choice. Use the data to explain why the assignment calls for a different choice.

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