Chapter 4 Flashcards
Write a dissociation equation for ammonium sulfate
in water, and predict what amount (mol) of each ion
will form from 5.0 mol of ammonium sulfate.
dissociation equation: (NH4)2SO4(s) —> 2NH4+ (aq) + SO42- (aq)
10 mols of NH4+
5 mols of SO42-
how do you find molarity?
mol/L
What is the molarity of an aqueous solution that contains
0.715 mol of glycine (H2NCH2COOH) in 495 mL?
1.44 M of glycine
How many grams of solute are in 1.75 L of 0.460 M
sodium monohydrogen phosphate buffer solution?
114g Na2HPO4
“Isotonic saline” is a 0.15 M aqueous solution of NaCl. How
would you prepare 0.80 L of isotonic saline from a 6.0 M
stock solution?
0.020 L
to prepare the solution, you would take 0.020 L of 6.0M stock and add 0.78L of water to get 0.80L of the 0.15M solution
Calculate the final volume (L) of a 0.0700 M solution
prepared by diluting 18.0 mL of 0.155 M lithium
carbonate with water
0.0399 L
In a simulation mercury removal from industrial wastewater,
0.050 L of 0.010 M mercury(II) nitrate reacts with 0.020 L of
0.10 M sodium sulfide to form mercury(II) sulfide and sodium
nitrate. How many grams of mercury(II) sulfide form?
0.12 g HgS
why is PbI2 insoluble?
because there is a stronger electrostatic attraction than water
are group 1A and NH4+ compounds insoluble or soluble?
soluble
nitrates, acetates, chlorates. insoluble or soluble?
soluble
chlorides, bromides, iodides. insoluble or soluble?
soluble
Ag+, Pb2+, Cu+, Hg2+, Hg22+. insoluble or soluble?
insoluble
flourides. insoluble or soluble?
soluble
Pb2+, group 2A. insoluble or soluble?
insoluble
sulfates. insoluble or soluble?
soluble
hydrogen carbonates. insoluble or soluble?
soluble
carbonates, chromates, and phosphates. insoluble or soluble?
insoluble
sulfides. insoluble or soluble?
insoluble
Na2CO3. insoluble or soluble?
soluble because Na2 is in group 1A
NH4OH. insoluble or soluble?
soluble because NH4 is soluble
Co(NO3)3. insoluble or soluble?
soluble because nitrate is soluble
Pb2CO3. insoluble or soluble?
insoluble because carbonate is insoluble
Mg(OH)2. insoluble or soluble?
insoluble because hydroxide is insoluble
AgHCO3. insoluble or soluble?
soluble because all bicarbonates are soluble
How many H+(aq) ions are in 25.3 mL of 1.4 M nitric acid?
2.13 x 10^22 H+ ions
what causes a reaction to be double displacement
when the cations switch places
A 50.00 mL sample of HCl is titrated with 0.1524 M NaOH.
The buret reads 0.55 mL at the start and 33.87 mL at the end
point. Find the molarity of the HCl solution.
0.1016M HCl
oxidation is
the loss of electrons, making it more positive
reduction is
the gain of electrons, making it more negative
what does a redox reaction involve
an electron transfer
O.N. for a monoatomic ion
the ions charge
O.N. for an atom is its elemental form( Na, O2, Cl2, etc.)
0
O.N. for group 1A
+1
O.N. for group 2A
+2
O.N. for fluorine
-1
O.N. for hydrogen
+1 when bound to non metals, and -1 when bonded to metals and boron
O.N. for oxygen
-2, and -1 when in peroxides(H2O2, Na2O2)
O.N. for Cl, Br, and I
-1 except when bound to O and with other halogens with the smaller period number, BrCl3: Cl = -1 and Br = +3 (bigger is positive, smaller is negative)
what type of reaction is C6H14(l) + O2(g) –> CO2(g) +H2O(g)
combustion reaction
