How many grams of dipotassium succinate trihydrate (K2C4H4O4·3H2O, MW = 248.32 g/mol) must be added to 780.0 mL of a 0.0348 M succinic acid solution to produce a pH of 5.921? Succinic acid has pKa values of 4.207 (pKa1) and 5.636 (pKa2).

Succinic acid (H2C4H4O4) is a diprotic acid and the succinate ion (C2H4O42–) is the completely deprotonated form of succinic acid. The addition of the succinate ion to the solution results in a buffer. Since the desired pH of the solution is greater than pKa2 for succinic acid, we know that the solution contains a mixture of the succinate ion and the monoprotonated intermediate species (HC2H4O4–).

Use the following data on ethanol-chloroform solutions at 35°C to calculate the activity coefficients of ethanol and chloroform based on the deviations from Raoult’s Law. Explain the meaning of your answers.

Can someone help me with this please!? Thank you!!

Using 2-bromobutane as your starting material, write a generic equation for each condition indicating the expected products and show the two possible mechanisms for nucleophilic substitutions.

1-bromobutane (n-butyl bromide)

1-chlorobutane

3-bromopropene (allyl bromide)

2-chlorobutane

2-bromobutane (sec-butyl bromide)

2-chloro-2-methylpropane

2-bromo-2-methylpropane (t-butyl-bromide)

chlorobenzene

For each reaction below, calculate the minimum amount of reactant needed to make the reaction go to completion. Identify each of the reaction below as precipitation, acid/base, or redox.

Start with 0.200g of Cu. 1. Cu(s) + 4HNO3(aq)  Cu(NO3)2(aq) + 2NO2(g) + 2H2O(l) 0.200g Cu + x mL of 15.8M HNO3

2. Cu(NO3)2(aq) + 2NaOH(aq)  Cu(OH)2(s) + 2NaNO3(aq) x mL of 6.00M NaOH

3. Cu(OH)2(s) + H2SO4(aq)  CuSO4(aq) + 2H2O(l) x mL of 2.00M H2SO4

4. CuSO4(aq) + Mg(s)  Cu(s) + MgSO4 x g of Mg

After reaction 4 is complete there may be some Mg left over. Hydrochloric acid will be added to the solution.  Write the reaction for magnesium reacting with hydrochloric acid.  What kind of reaction is this?  Why does the HCl not react with the copper? (hint: activity series)

i. A two-level system has a ground level with four degenerate states and an excited level with two degenerate states at 450 cm−1 above the ground level. Please plot the ratio of the number of particles occupying the excited level to the number of particles occupying the ground level as function of temperature (Make sure that the end points and curvature are accurate but anything else can be qualitative).

How do i need more Info? This is all given to me

A 1.9450 g sample containing only Na₂CO₃ and NaHCO₃ is titrated with 35.31 mL of 0.8724 M HCl. Calculate the percentage sodium carbonate and sodium bicarbonate.

29).

A 50.00-mL sample of 0.100 M KOH is titrated with 0.100 M HNO₃. Calculate the pH of the solution after 52.00 mL of HNO₃ is added.

1.29

2.71

11.29

12.71

None of these choices are correct.

As a chemist for an agricultural products company, you have just developed a new herbicide,"Herbigon," that you think has the potential to kill weeds effectively. A sparingly soluble salt, Herbigon is dissolved in 1 M acetic acid for technical reasons having to do with its production. You have determined that the solubility product Ksp of Herbigon is 8.00×10⁻⁶.

Although the formula of this new chemical is a trade secret, it can be revealed that the formula for Herbigon is X-acetate (XCH3COO, where "X" represents the top-secret cation of the salt). It is this cation that kills weeds. Since it is critical to have Herbigon dissolved (it won't kill weeds as a suspension), you are working on adjusting the pH so Herbigon will be soluble at the concentration needed to kill weeds. What pH must the solution have to yield a solution in which the concentration of X+ is 4.50×10⁻³M ? The pKa of acetic acid is 4.76.

Which of the following is an example of the law of multiple proportions?

When 28 g of calcium chloride was dissolved in 100g water in a coffee-cup calorimeter, the temperature rose from 25* Celcius to 41.3. What is the enthalpy change for this process? Assume the solution is equal to the specific heat of water.

Determine the integrated form of the third-order rate law of the form:

-d[A]/dt = k[A]^3.

Starting from a 0.5 M initial concentration of A, and a rate constant of 0.1 M^-2 * s^-1, how much time would be required before reaching a 0.3M concentration of A?

Answer Options

How does increasing the temperature of a liquid affect the rate of vaporization?

Increasing the temperature has no effect on the rate of vaporization.

The rate of vaporization decreases.

The rate of vaporization increases.

How does increasing the surface area of a liquid affect the rate of vaporization?

The rate of vaporization increases.

The rate of vaporization decreases.

Increasing the surface area of a liquid has no effect on the rate of vaporization.

How does the rate of vaporization for two liquids with differing intermolecular forces compare assuming all other variables are constant?

Intermolecular forces have no effect on the rate of vaporization. The two liquids will have the same rate of vaporization assuming all other variables are constant.

The liquid with the stronger intermolecular forces has a greater rate of vaporization than the liquid with the weaker intermolecular forces.

The liquid with the weaker intermolecular forces has a greater rate of vaporization than the liquid with the stronger intermolecular forces.

Additional aspects of aqueous solution:

4. In a 50.0mL titration of a strong acid (HCl) with a strong base (NaOH) calculate the pH when the following volumes of a 0.100M NaOH solution are added:

a.45.0mL

b.51.0mL

25.0 mL of a 4.21 M HCl solution at 25.2°C and 50.0 mL of a 2.50 M NaOH solution at 25.2°C are reacted together to give a final temperature of 44.1°C. The specific heat of the solution is 3.88 J/g°C and it weighs 76.6 grams. From this information, determine:

a. the limiting reactant for this reaction

b. the heat produced by the reaction (q) in units of Joules.

c. the enthalpy of the reaction (∆H) in units of kJ/mole.