CHM 113 LAB FINAL QUESTIONS &
ANSWERS 100% CORRECT
how to find mass % of water? - ANSWERThe mass of water lost is the difference
between the hydrated salt mass and the mass of the residue after drying. mass %
water of hydration = g water / g hydrated salt x 100
Emperical formula for a hydrate? - ANSWERFinding the Empirical Formula of a
Hydrate
1) Find the mole ratio of H2O to salt in order to find the value of "X" for a hydrate:
Mol ratio= mol water/mol anhydrous salt
2) When calculating the total molar mass, add the molar mass of the water to the
molar mass of the salt.
What are electrolytes? - ANSWERElectrolytes are compounds that form cations and
anions when dissolve in water.
Ionic compounds, acids, and bases are electrolytes.
What happens in a precipitation reaction? - ANSWERPrecipitation reactions where
an insoluble
compound (a precipitate) is formed. The driving force for this reaction is the
formation of an insoluble ionic compound.
What happens in an acid base neutralization? - ANSWERAcid-base neutralization
Reactions where H2O is
formed. The driving force for this reaction is the formation of the molecular
compound, H2O.
1st law of Thermodynamics? - ANSWERlaw of conservation of energy which states
that while energy can be converted or transferred, it is not created or destroyed.
% Transmittance? - ANSWERThe ratio of the intensity of light leaving the solution
(I1) to the intensity of the initial intensity (I0), converted to percentage is called
percent transmittance (%T)
What happens in a Gas forming reaction? - ANSWERGas-forming reaction were
CO2 or H2S are formed
by the reaction of an acid with a carbonate, bicarbonate, or sulfide.
What happens when acids dissolve in water? - ANSWERWhen acids dissolve in
water, the cation formed
is an H+(aq) ion.
What happens when bases dissolve in water? - ANSWERWhen bases dissolve in
water, the anion formed is an OH−(aq) ion.
ANSWERS 100% CORRECT
how to find mass % of water? - ANSWERThe mass of water lost is the difference
between the hydrated salt mass and the mass of the residue after drying. mass %
water of hydration = g water / g hydrated salt x 100
Emperical formula for a hydrate? - ANSWERFinding the Empirical Formula of a
Hydrate
1) Find the mole ratio of H2O to salt in order to find the value of "X" for a hydrate:
Mol ratio= mol water/mol anhydrous salt
2) When calculating the total molar mass, add the molar mass of the water to the
molar mass of the salt.
What are electrolytes? - ANSWERElectrolytes are compounds that form cations and
anions when dissolve in water.
Ionic compounds, acids, and bases are electrolytes.
What happens in a precipitation reaction? - ANSWERPrecipitation reactions where
an insoluble
compound (a precipitate) is formed. The driving force for this reaction is the
formation of an insoluble ionic compound.
What happens in an acid base neutralization? - ANSWERAcid-base neutralization
Reactions where H2O is
formed. The driving force for this reaction is the formation of the molecular
compound, H2O.
1st law of Thermodynamics? - ANSWERlaw of conservation of energy which states
that while energy can be converted or transferred, it is not created or destroyed.
% Transmittance? - ANSWERThe ratio of the intensity of light leaving the solution
(I1) to the intensity of the initial intensity (I0), converted to percentage is called
percent transmittance (%T)
What happens in a Gas forming reaction? - ANSWERGas-forming reaction were
CO2 or H2S are formed
by the reaction of an acid with a carbonate, bicarbonate, or sulfide.
What happens when acids dissolve in water? - ANSWERWhen acids dissolve in
water, the cation formed
is an H+(aq) ion.
What happens when bases dissolve in water? - ANSWERWhen bases dissolve in
water, the anion formed is an OH−(aq) ion.
