Hello , I'm struggling in the following questions and I need an explanation if it is possible

question 1) :A 51.0 mL aliquot of HCl(aq) of unknown concentration was titrated with 0.226 M NaOH(aq). It took 102.4 mL of the base to reach the endpoint of the titration. what the concentration (M) of the acid was ?

question 2) :How many moles of BaCl2 are formed in the neutralization of 196.5 mL of 0.095 M Ba(OH)2 with aqueous Hal?

question 3) : Lead ions can be precipitated from aqueous solutions by the addition of aqueous iodide: Pb2+(aq) + 2I-(aq) → PbI2(s)

Lead iodide is virtually insoluble in water so that the reaction appears to go to completion. How many milliliters of 1.180 M HI(aq) must be added to a solution containing 0.200 mol of Pb(NO3)2(aq) to completely precipitate the lead?

question 4) :What are the respective concentrations (M) of Fe3+ and I- afforded by dissolving 0.300 mol FeI3 in water and diluting it to 750 mL?

question 5 ) :What is the concentration (M) of a NaCl solution prepared by dissolving 7.6 g of NaCl in sufficient water to give 490 mL of solution?

what is differences between the heat (q) of a reaction and the reaction enthaply (delta H_RXN)?

Which compound will have the larger R_f value on a SiO₂ TLC plate using 10% ethyl acetate/ hexane as eluent: 3-decanone or 3-decanol, toluene or benzoic acid, cyclooctane or cyclooctanone? Why?

10.5 mL of 0.100M ammonium chloride aqueous solution is titrated with 0.100 M NaOH(aq).

What type of solution is present when V_NaOH = 20.00 mL?

Select one:

a. strong acid

b. strong base

c. weak acid

d. weak base

e. buffered

A ruby has a mass of 12.10 carats (1 carat = 200.0 mg). Rubies are made of crystalline from of Al2O3. What percentage of the mass of the ruby is aluminum? How many atoms of alluminum are in this ruby? The density of rubies is 4.02g/cm^3. What is the volume of the ruby?

Problem 20.26
A voltaic cell similar to that shown in Figure 20.5 in the textbook is constructed. One electrode compartment consists of an aluminum strip placed in a solution of Al(NO3)3, and the other has a nickel strip placed in a solution of NiSO4. The overall cell reaction is
2Al(s)+3Ni2+(aq)→2Al3+(aq)+3Ni(s)
Part A
What is being oxidized?
Express your answer as a chemical expression.

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Part B
What is being reduced?
Express your answer as a chemical expression.

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Part C
Write the half-reactions that occur in the two electrode compartments.
Express your answer as a chemical equation. Identify all of the phases in your answer.

anode reaction:
3Ni2++6e−→3Ni

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Incorrect; Try Again; 5 attempts remaining
Part D
Express your answer as a chemical equation. Identify all of the phases in your answer.

cathode reaction:

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Part E
Which electrode is the anode, and which is the cathode?

Which electrode is the anode, and which is the cathode?

Al electrode is the anode, Ni electrode is the cathode.
Ni electrode is the anode, Al electrode is the cathode.

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Part F
Indicate the signs of the electrodes.

Indicate the signs of the electrodes.

Ni electrode is negative, Al electrode is positive.
Al electrode is negative, Ni electrode is positive.

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Part G
Do electrons flow from the aluminum electrode to the nickel electrode, or from the nickel to the aluminum?

Do electrons flow from the aluminum electrode to the nickel electrode, or from the nickel to the aluminum?

Electrons flow from the aluminum electrode to the nickel electrode.
Electrons flow from the nickel electrode to the aluminum electrode.

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Part H
In which directions do the cations and anions migrate through the solution? Assume the Al is not coated with its oxide.

In which directions do the cations and anions migrate through the solution? Assume the  is not coated with its oxide.

Cations migrate to the nickel electrode, anions migrate to the aluminum electrode.
Cations and anions migrate to the aluminum electrode.
Cations and anions migrate to the nickel electrode.
Cations migrate to the aluminum electrode, anions migrate to the nickel electrode.

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K_sp for PbCl₂ is 10^-5. Determine if a percipitate will form when following solutions are mixed:

100mL of 0.002 M Pb(NO₂₎₂ + 100mL 0.02 M KCl

Find molar solubility of BaF₂ (K_sp=10^-7) in 0.001 M NaF

Determine the rate law for the overall reaction (where the overall rate constant is represented as k).

Step 1 A -> B+C slow

step 2 C + D -> E fast

overall A+D -> B+E

Rate = ??

Show work

3. Diet cola drinks have a pH of about 3.0, while milk has a pH of about 7.0. How many times greater is the H3O+ concentration in diet cola than in milk? A) 2.3 times higher in diet cola than in milk B) 400 times higher in diet cola than in milk C) 0.43 times higher in diet cola than in milk D) 1,000 times higher in diet cola than in milk E) 10,000 times higher in diet cola than in milk

4. A 5.5 L sample of a 0.25 M HNO3 solution is mixed with 1.2 L of a 0.34 M HCl solution. What is the pH of the mixture? A) 0.23 B) 0.57 C) 1.07 D) 0.50 E) 0.84

5. Predict the direction in which the equilibrium will lie for the reaction H3PO4(aq) + HSO4–(aq) H2PO4–(aq) + H2SO4(aq). Ka1(H3PO4) = 7.5 × 10–3; Ka(H2SO4) = very large A) to the right B) to the left C) in the middle

6. Predict the direction in which the equilibrium will lie for the reaction H2SO3(aq) + HCO3– (aq) HSO3–(aq) + H2CO3(aq). Ka1(H2SO3) = 1 × 10–2; Ka1(H2CO3) = 4.2 × 10–7 A) to the right B) to the left C) in the middle

7. Which one of these salts will form a basic solution upon dissolving in water? A) NaI B) NaF C) NH4NO3 D) LiBr E) Cr(NO3)3

8. Which one of these salts will form an acidic solution upon dissolving in water? A) LiBr B) NaF C) NH4Br D) KOH E) NaCN

9. Which one of the following salts will form an acidic solution on dissolving in water? A) LiBr B) NaF C) KOH D) FeCl3 E) NaCN

Explain the significance of charge balance and mass balance.

III. Buffer Solutions

A. Buffer 1

i. Measure out 10.0 mL of 1.0 M CH₃COOH and 25.0 mL of 1.0 M sodium acetate (NaCH₃COO) into a beaker

2. What is the concentration of acetic acid in this solution after mixing. (include units) [CH₃COOH] ?

3. What is the concentration of acetate ion in this solution after mixing.(include units) [CH₃COO^-] ?

4. Calculate the expected pH of this buffer solution.

5. Measured pH of this buffer solution pH: 5.31

I have no idea how to do number 2,3,4 and I have to repeat these processes/ questions for different solutions. If you could show me how to do these, I would greatly appreciate it! Thank you so much in advance.

1.  The dipole moment of BrCl is 0.518 D and the distance between atoms is 213.9 pm. What is the percent ionic character of the BrCl bond?

A first-order reaction has a half-life of 17.3 minutes. What is the time required for the reactant concentration to decrease to 2.0% of it's origional value?

Thank you!

An aqueous solution contains 0.392 M ethylamine (C₂H₅NH₂).

How many mL of 0.313 M hydrobromic acid would have to be added to 225 mL of this solution in order to prepare a buffer with a pH of 10.700?

Why would a repeating unit of PET (polyethyleneterephthalate) be used to calculate the limiting reagent and yield instead of the molecular weight of the polymer? Is it just because it is a polymer and only its monomer needs to be taken into account?