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: Complete and balance each of the following equations for gas-evolution reactions.HBr(aq) + NiS(s) →

Solution: Complete and balance each of the following equations for gas-evolution reactions.HBr(aq) + NiS(s) →

Problem

Complete and balance each of the following equations for gas-evolution reactions.

HBr(aq) + NiS(s) →

Solution
  • Reaction appears to be a double displacement reaction where counterions are being switched
  • So HBr and NiS will dissociate as H+, Br-, Ni2+ and S2-
  • This will produce H2(from H+ and S2-) and NiBr2 (from Ni2+ and Br-).
  • H2(hydrogen sulfide) is present as gas in standard conditions while NiBr2 will appear as aqueous species (soluble acc. to the solubility rules) 
  • All bromides (Br- ) are soluble except AgBr, Hg2Br2, HgBr2, and PbBr2 which are insoluble
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