Assignment 2 Flashcards
Solvent (Definition)
The substance present in the greatest quantity in a solution
Solution (Definition)
A combination of two or more substances that exist as a homogeneous mixture.
Solute (Definition)
The substance of lesser quantity in a solution
Solubility (Definition)
A measure of the amount of substance that will dissolve in a given amount of solvent at a given temperature
Aqueous Solution (Definition)
Solution in which water is solvent
Concentration (Definition)
Amount of solute / Volume of solution
Molarity (Definition)
M = Moles of solute / liters of solution = mol / L
-Represent the molar concentration of the solution
-When ionic solids (salts)are dissolved in polar solvents such as H2O, they dissociate into anions and cations.
-Water can also dissolve non-ionic compounds: as long as they are polar
Evidence of a possible chemical reactions
-Formation of precipitate ( an insoluble solid).
-Formation of a gas
-Change in color
-Change in temperature
-Dissolution of a precipitate
3 most common types of reactions
- precipitation reactions
-acid-base reactions
-oxidation-reduction reactions
Precipitation reactions(Definition)
- Occurs when a substance is not solugle or only, it does not dissolve well.
-If you try to dissolve more of the substance than the solvent can hold, the excess susbtance will remain undissolved and form a solid. This solid is called a precipitate.
Chemical Equation for Precipitation Reactions
Parts per million (PPM)
Unit of concentration often used to measured small quantities of a substance in a solution.
Part Per Billion (PPB)
Is another unit of concentration, used to measure even smaller quantitates.
If CaC204*H2O = 5 mol, what is the value of Ca ?
5 mol since for every CaC204*H2O there is one Ca, then it is the same
Acid-Base Reactions
-Acid is a proton donor.
-A base is a proton acceptor.
