Ch.4 - Chemical Quantities & Aqueous ReactionsWorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Solution: A solution containing several metal ions is treated with dilute HCl; no precipitate forms. The pH is adjusted to about 1, and H2 S is bubbled through. Again, no precipitate forms. The pH of the solution is then adjusted to about 8. Again, H2 S is bubbled through. This time a precipitate forms. The filtrate from this solution is treated with (NH4 )2 HPO4. No precipitate forms.Which of these metal cations are either possibly present or definitely absent: Al3+, Na+, Ag+, Mg2+?

Problem

A solution containing several metal ions is treated with dilute HCl; no precipitate forms. The pH is adjusted to about 1, and H2 S is bubbled through. Again, no precipitate forms. The pH of the solution is then adjusted to about 8. Again, H2 S is bubbled through. This time a precipitate forms. The filtrate from this solution is treated with (NH4 )2 HPO4. No precipitate forms.

Which of these metal cations are either possibly present or definitely absent: Al3+, Na+, Ag+, Mg2+?