BONUS: Lab Techniques and ProceduresWorksheetSee 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 student combined 1 mL of 1.0 M solutions of nitrate salts of barium, calcium, magnesium, and strontium with several different testing reagents. The observations are recorded in this table . Note: ppt = precipitate, rxn = reactionAn unknown solution contains two of these four ions: barium, calcium, magnesium, and stronium. The unknown solution forms a white precipitate with H2SO4 and it does not react with K2CrO4. What conclusion about the two ions in the unknown can be drawn from this evidence?(A) It contains only strontium and barium ions.(B) It contains only barium and calcium ions(C) It contains barium ion and either magnesium or calcium ions.(D) It contains strontium ion and either magnesium or calcium ions.

Solution: A student combined 1 mL of 1.0 M solutions of nitrate salts of barium, calcium, magnesium, and strontium with several different testing reagents. The observations are recorded in this table .Note: ppt

Problem

A student combined 1 mL of 1.0 M solutions of nitrate salts of barium, calcium, magnesium, and strontium with several different testing reagents. The observations are recorded in this table .
Note: ppt = precipitate, rxn = reaction

An unknown solution contains two of these four ions: barium, calcium, magnesium, and stronium. The unknown solution forms a white precipitate with H2SO4 and it does not react with K2CrO4. What conclusion about the two ions in the unknown can be drawn from this evidence?

(A) It contains only strontium and barium ions.

(B) It contains only barium and calcium ions

(C) It contains barium ion and either magnesium or calcium ions.

(D) It contains strontium ion and either magnesium or calcium ions.