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Chapter 4
All Webassign assignments are up for chapter 4.
This chapter will be subdivided into two parts.
Part 1 will include solution properties and electrolytes, molarity and stiochiometry with solutions, dilutions, and titration calculations.
Part 2 will include reaction types and predicting products from redox reactions, precipitation double replacement reactions, acid base reactions, combustion reactions, etc.
Electrolyte--a substance whose aqueous solution conducts electricity.
Electrolytes are generally soluble salts and acids.
Hydration--the process of ions separating and becoming surrounded with water molecules. This occurs when electrolytes are dissolved in water.
Molarity (M) = mol solute/L solution
A volumetric flask is used to make a solution of known concentration. Solutions of lesser concentrations may be prepared from more concentrated solutions. Such problems are called dilution problems. For these problems, calculate the number of moles desired in the new solution, and then find the volume of the more concentrated solution that contains that number of moles. In other words,
M1V1 = M2V2
For solution stoichiometry remember that the initial step is the only one that is different from the previous chapter. See webassign on redox and molarity.
Titration is an analytical technique for finding the concentration of a solution. This is a normal stoichiometry problem.
