1. Converting pH=2.54 to hydrogen ion concentration, [H+].
2. What is the pH of a 7.93×10-4 molar solution of a strong acid?
3. If the pH of a solution of a strong base is 8.75, what is its hydroxyl ion concentration? What is its hydrogen ion concentration?
4. What is the pH of 37.9 mM solution of HNO3? What is its pOH?
5. Concert the hydroxyl ion concentration, 9.15 mM to pH
6. A 0.017M solution of HCL is mixed with a 0.017M solution of NaOH. What is the pH of the final mixture?
7. The pOH a drug solution is 6.82; what is the pH of the solution? What is the hydroxyl ion concentration is the solution is a strong base?
I need help with these 7 questions!
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Show that 15M acid is approximately 90% acetic acid and 10% water by weight?
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How many calcium atoms are in 33.8g of calcium?
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The apparatus below contains ammonia, neon, and hydrogen
chloride gases at a temperature
of 27ºC. The valve in the center is opened and the ammonia reacts
with the hydrogen chloride:
NH3(g) + HCl(g) → NH4Cl(s)
Neon does not react.
a) What mass of ammonium chloride will be formed?
b) What will be the total pressure in the apparatus after the
reaction is complete,
assuming the temperature remains constant?
|volume = 635 mL valve
NH3 pressure = 0.875 atm
Ne pressure = 0.893 atmvolume = 429 mL
HCl pressure =
1.613 atm
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What intermolecular force(s) is/are present in acetone that it would be a liquid at room temperature? Is there more than one force? If yes, which is stronger and which is weaker?
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1- a. What mass of nitrogen has the same volume as 15.00 grams of hydrogen at -25oC and .750atm?
b. What is the density of an unknown gas at 258 K and 1.500 atm whose molar mass is 126 g/mole.
(Please type the answers, don't write them down on a paper)
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Brass is a substitutional alloy consisting of a solution of copper and zinc. A particular sample of red brass consisting of 80.0% Cu and 20.0% Znby mass has a density of 8760kg/m3 .
What is the molality of Zn in the solid solution?
What is the molarity of Zn in the solution?
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Find the pH during the titration of 20.00 mL of 0.1630 M benzoic acid, C6H5COOH (Ka = 6.3 ? 10-5), with 0.1630 M NaOH solution after the following additions of titrant.
(a) 0 ml
(b) 10.00 mL
(c) 15.00 mL
(d) 19.00 mL
(e) 19.95 mL
(f) 20.00 mL
(g) 20.05 mL
(h) 25.00 mL
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Zinc sulfide, ZnS, exists in two main crystal forms. The more stable form, zinc blende, is face-centered cubic with tetrahedral coordination geometry and has density of 4.09 g/cm3. Use 184 pm for the ionic radius of S2- to calculate the ionic radius of Zn2+.
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Starting with a 30% (w/w) solution of hydrogen peroxide, how many mL would you need to dilute in order to end up with 25.00mL of a 3.6 M hydrogen peroxide solution? What are the hazards and safety precautions associated with 30% hydrogen peroxide. Assume a solution density of 1.11 g/mL.
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This question is about concentration measurements and its effect on E and K.
Cu/Cu^+2 // Ag/Ag^+2
It's same voltaic cell setup directions but for different concetrations of Ag+2 solutions: 0.2M, 0.02M, 0.0020M and 0.00020M.
Calculate the E of the above different Ag+2 solution by using this form of the Nernst equation: E= E0 - (0.0257/n)*lnK where K is the qulilbrium constant and n is the number of electrons and E0 is standerd cell pontential at STP
Please show the process and explains. Thank you
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Explain, in detail, why atomic radii do not increase uniformly with increasing atomic number. Give specific examples in your answer.
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A sample of butane gas, C4H10, was slowly heated at constant pressure of .80 bar. The volume of the gas was measured a series of different temperatures and plot of volume vs. temperature was constructed. The slope of the line was .0208 L/K. What was the mass of the sample of butane? Please explain.
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A 55.0 mL solution of 0.126 M potassium alaninate (H2NC2H5CO2K) is titrated with 0.126 M HCl. The pKa values for the amino acid alanine are 2.344 (pKa1) and 9.868 (pKa2), which correspond to the carboxylic acid and amino groups, respectively. a) how do you calculate the PH of the first equivalent and b) the second equivalent? please help
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a) Describe the glass transition temperature of polymers and ceramics
b) Compare and contrast the rules that underly the formation of crystalline structures in ceramics and polymers
In: Chemistry