How many mL of 6.0 NaOH must be added to 0.50 L of 0.20 M HNO2 to prepare a pH = 3.86 buffer?

The vapor pressure of solid benzene is 299 Pa at -30ºC and 3270 Pa at 0ºC. The vapor pressure of liquid benzene is 6170 Pa at 10ºC, and 15,800 Pa at 30ºC. (a) Calculate the triple point of benzene (temperature and pressure at which solid, liquid, and vapor all coexist). This is obtained by using the Clausius-Clapeyron equation first to determine ∆vapH for the solid and the liquid, and then to give equations for the curves defining the solid-vapor equilibrium and the liquidvapor equilibrium, and solving both the latter equations simultaneously.

so i have worked out the ∆vaporization H and ∆sublimation H

∆vaporization H=33.6 KJ/mol

∆sublimation H =44.3 KJ/mol

but i am lost after that what do i do next? how do i finish finding the temperature and pressure at the triple point?

a. When 18.0 mL of a 8.06×10^-4 M aluminum chloride solution is combined with 15.0 mL of a 5.62×10^-4 M potassium phosphate solution does a precipitate form?  (yes or no)

For these conditions the Reaction Quotient, Q, is equal to

b. When 25.0 mL of a 8.11×10^-4 M iron(III) nitrate solution is combined with 25.0 mL of a 2.02×10^-4 M sodium sulfide solution does a precipitate form?  (yes or no)

For these conditions the Reaction Quotient, Q, is equal to .

c. When 15.0 mL of a 9.22×10^-4M ammonium carbonate solution is combined with 25.0 mL of a 6.32×10^-4M nickel(II) nitrate solution does a precipitate form?  (yes or no)

For these conditions the Reaction Quotient, Q, is equal to .

Fill in the blanks with the given words.

In the last 40 years, the concentration of carbon dioxide in the air has increased by more than 20%. IR spectroscopy shows that carbon dioxide absorbs IR radiation.

If carbon dioxide molecules absorb IR radiation, where does that energy go? How does the increase in the concentration of carbon dioxide affect the air temperature?

If carbon dioxide molecules absorb IR radiation, the energy goes into( ___). Vibrating carbon dioxide molecules make other molecules in the air move faster. This means that the average (___)energy of the air molecules(___)and therefore the air temperature(___). Since the concentration of carbon dioxide has increased in the last 40 years, ( ___)IR radian is now absorbed leading to(___)temperatures.

Answer bank: higher, lower, potential, kinetic, increases, decreases, less, more, bond breaking, rotational motion, vibrational motion

What is the pH after adding 10.0 mL of 0.10 M HCl to a 90.0 mL buffer solution of 0.60 M CH₃COOH and 0.40 M CH₃COONa at 25 °C? (K_a = 1.8 x 10⁻⁵)? What reaction will occur when HCl is added to the above buffer?

1) How many moles of acetic acid are present after the reaction?

2) How many moles of acetate ion are present after the reaction?

3) What is the concentration (in M) of acetic acid after the reaction?

Consider the titration of a 19.5 mL sample of 0.903 M HC2H3O2 with 0.18 M NaOH. Ka(HC2H3O2) = 1.8x10-5 Determine the pH at the equivalence point. Enter to 4 decimal places.

12. The pH of a 0.063 M weak monoprotic acid is 3.61. Calculate the Ka of the acid.

Can you explain the major differences in the synthesis of Pentaammineaquacobalt(III) chloride and pentaamminechlorocobalt(III) chloride? The same reagents are used, but in different order. (NH3, NH4Cl, H2O2, CoCl2•6H2O ) Also, one synthesis involves heat and the other doesn't. Can you explain what is happening in the synthesis of each, and why the order makes a difference?

Find αH2A for a diprotic acid (H2A) at pH 1.00 (Ka1 = 1.20 × 10-2 & Ka2 = 5.37 × 10-7)

Using the below data:

Mass (g) of copper gluconate: 1.0 g

Mass (g) of wrapper: 0.6 g

Mass (g) of wrapper + Cu: 0.9 g

Mass (g) of Cu: 0.3 g

Mass (g) of gluconate: 0.7 g

1. Determine the chemical formula of copper gluconate?

2. Calculate the percent composition of copper and the percent composition of gluconate in the compound copper gluconate?

3. Create a Experimental Chemical Formula:

In vitamin C titration(ascorbic acid) expirement, Why the KIO3 is weighted accurately, while KI is only roughly weighted?

The hydrogen atom can absorb light of wavelength 2626 nm.

A)Determine the initial value of n associated with this absorption.

B)Determine the final value of n associated with this absorption.

If you had ddGTP used in sanger sequencing, describe how the nucleotide would be different than dGTP. Why is it important in Sanger sequencing? Be detailed in your repsonse.

Can anyone help with this question?

A solution containing 0.10 M Zn²⁺ and 0.10 M Fe²⁺ is saturated with H₂S (i.e. 0.10 M H₂S). (a) What must the H+ concentration be to separate these ions by selectively precipitating ZnS? Note: ZnS has Ksp=1.2x10^-23; FeS has Ksp=3.7x10^-19. (b) What is the smallest concentration of Zn²⁺ that can be achieved without precipitating any of the Fe²⁺ as FeS?

A solution consists of 44.3 g of hydrochloric acid (HCl), 75.7 g water, and has a volume of 101 mL.

Calculate the weight percent of HCl, the molality of HCl, the mole fraction of HCl, and the molarity of HCl in the solution.

A solution of barium chloride (BaCl₂) in water is 5.000 % barium chloride by mass. Its density is 1.0434 g cm^-3 at 20 °C. Compute its molarity, mole fraction, and molality at this temperature.

Molarity BaCl₂ =  

Mole fraction BaCl₂ =

Molality BaCl₂ =  

The EPA's secondary standards for contaminants that may cause cosmetic or aesthetic effects in drinking water suggest an upper limit of 5.00×10^-2 mg/L for manganese . If 1.40×10⁴ liters of water in a storage tank contains 2.66 grams of Mn, what is the contaminant level in ppm? Is this level acceptable based on EPA guidelines?

ppm   _________acceptable/not acceptable