Calculate the grams of K2CO3 required to prepare 510.0 mL of a 0.777 g/L K+ solution. [Answer in 4 SF].
In: Chemistry
The Ksp of PbI2 is 1.4 x 10-8. Calculate the molar solubility of PbI2 in 0.01 M NaI.
| 1.5 x 10-3 M |
| 1.4 x 10-4 M |
| 1.4 x 10-6 M |
| 5.6 x 10-2 M |
In: Chemistry
8. a. What is the molarity of a solution of calcium chloride which contains 33500 mg of solute in a total volume of 0.352L?
b. What is the molarity of a solution of LiI which contains 26800 mg of solute in a total volume of 0.282L?
c. What is the molarity of a solution of calcium chloride which contains 0.440moles of solute in a total volume of 0.872L?
9. a. How many mL of solvent should be added to 0.99L of a 1.5M solution if you want a final concentration of 0.74M.
b. 0.096L of a 2.9M solution is diluted to a final volume of
250mL. What is the
resultant molarity?
c. How many L of solvent should be added to 0.77L of a 1.0M
solution if you want a
final concentration of 0.45M?
In: Chemistry
I need to identify the cations A through G as K+, Cu2+, Ag+, Ba2+, Fe3+, Mg2+, or Pb2+
The unknown cation is Br-/OH-
From what I believed I've figured out is:
K+ = F
Cu2+ = A or E
Ag+ = B or C
Ba2+ = G
Fe3+ = A or E
Mg2+ = A or E
Pb2+ = D
I believe this may be correct but I am unable to figure out Cu2+, Ag+, Fe3+, and Mg2+. I also need to make sure that they are correct. This lab is very confusing to me so I am trying to figure it out.
| A | B | C | D | E | F | G | |
| Br- | Soluble | Insoluble | Insoluble | Soluble | Soluble | Soluble | Soluble |
| SO4 2 - | Soluble | Soluble | Soluble | Insoluble | Soluble | Soluble | Insoluble |
| PO4 3- | Insoluble | Insoluble | Insoluble | Insoluble | Insoluble | Soluble | Insoluble |
| OH- | Insoluble | Insoluble | Insoluble | Insoluble | Insoluble | Soluble | Soluble |
| Unknown (Br-/OH) |
I need to write a molecular, ionic, and complete ionic equations
for each of the reaction that produced a precipitate.
Reaction 1 - 13
For example,
Reaction 1:
Molecular:
Total Ionic:
Net Ionic:
In: Chemistry
A 2.335 gram sample of an organic compound containing C, H and O is analyzed by combustion analysis and 5.030 grams of CO2 and 2.060 grams of H2O are produced. In a separate experiment, the molar mass is found to be 102.1 g/mol. Determine the empirical formula and the molecular formula of the organic compound.
Enter the elements in the order C, H, O
empirical formula =
molecular formula =
In: Chemistry
You have 100ml of 1.0M PIPES buffer at the pH = 5.76. The pKa for PIPES is 6.76. How much 10 M NaOH would you need to add to change the pH from 5.76 to 6.76? Do not concern yourself with dilution effects.
a. 2.0 ml
b. 4.0 ml
c. 8.0 ml
d. 9.8 ml
The answer is B I am just unsure how to arrive there.
In: Chemistry
A system at equilibrium contains I 2 (g) at a pressure of 0.19 atm and I(g) at a pressure of 0.22 atm . The system is then compressed to half its volume. Part A Find the pressure of I 2 when the system returns to equilibrium. Part B Find the pressure of I when the system returns to equilibrium.
In: Chemistry
Colorimetry:
-Definition
-Principle
-Theories
-Instrument used
-Advantages
-Disadvantages
In: Chemistry
1. What happens when a strong acid suchas HBr dissolves in water?
2. What is the PH of a solution with [H+] of 3.6*10^-4?
3. A sample of urine has a pH 7.9. Is the sample acidic, basic, or neutral? What is the hydrogen ion concentration in the urine sample?
In: Chemistry
A chemist adds 225.0 mL of a 8.0x10-5 mmol/L solution of silver (II) oxide solution to a reaction flask. Calculate the mass of micrograms in silver (II) oxide the chemist has added to the flask..Please answer using two significant figures.
In: Chemistry
The following data show the rate constant of a reaction measured at several different temperatures. Temperature (K) at 310 has a rate constant (1/s) of 4.65×10^−2 . Temperature (K) at 320 has a rate constant (1/s) of 0.139. Temperature (K) at 330 has a rate constant (1/s) of 0.386. Temperature (K) at 340 has a rate constant (1/s) of 1.01. Temperature (K) at 350 has a rate constant (1/s) of 2.52. Part A) Use an Arrhenius plot to determine the activation barrier for the reaction. Part B) Use an Arrhenius plot to determine the frequency factor for the reaction.
In: Chemistry
If the Xe atom can accomodate a maximum of 14 electrons in its expanded valence shell, what is the formal charge on the Xe atom in the most significant contributor to the resonance hybrid of the molecule XeO4?
| +3 |
| +2 |
| 0 |
| +1 |
| –1 |
In: Chemistry
Label blood types O and A with the correct monosaccharides. The defining monosaccharide is noted by the gray and orange bond. Each monosaccharide may be used more than once. Note: If any part of this question is answered incorrectly, a single red X will appear on the left-hand side.
In: Chemistry
Draw a dash-wedge structure for (2S,3R)-3-bromo-6,6-dimethylocta-7-en-2-ol. Draw a dash-wedge structure for (3S,4R)-4-chloro-3,5-dimethylhex-1-yne.
In: Chemistry
Be sure to answer all parts.
Calculate E o , E, and ΔG for the following cell reactions:
(a) Mg(s) + Sn2+(aq) ⇌ Mg2+(aq) + Sn(s) where [Mg2+] = 0.045 M and [Sn2+] = 0.065 M
E o = _________ V
E = ____________ V
ΔG = __________kJ
(b) 3Zn(s) + 2Cr3+(aq) ⇌ 3Zn2+(aq)+ 2Cr(s) where [Cr3+] = 0.080 M and [Zn2+] = 0.0055 M
E o = __________ V
E = ____________ V
ΔG = ___________kJ
In: Chemistry