wallace

Newest questions and responses by wallace
  1. chemistry

    If the Ksp of Zn (CN)2 (s) is 3×10^-16, what percentage of Zn2+ is precipitated when we know that [Zn 2+]=0.36M [CN-]=5×10^-3M Ksp=3×10^-16

    asked on March 11, 2019
  2. chemistry

    Calculate the PH value of 1.00 L of a solution prepared by mixture of 1.00 mol HCl, 2.00 moles of NaOH and 1.50 moles of NH4Cl Kb (NH3) = 1.8 * 10 ^-5

    asked on January 13, 2019
  3. chemistry

    Find a pH of a 0.100 M solution of the weak acid HA. The pKa for the acid 5.0

    asked on January 10, 2019
  4. chemistry

    During electrolysis of an aqueous NaOH solution in the anode, 2.8 L of Oxygen are released (under conditions considered normal). How much hydrogen is free in the cathode?

    asked on December 28, 2018
  5. chemistry

    A W element that is in the IIA family combines with a Y element in the VIIA family and results in an ionic compound whose only likely formula is: (demonstrate the bond) a)WY b)Y²W c)WY² d)W²Y

    asked on December 9, 2018
  6. chemistry

    In a reaction of ammonia production (NH3), 360g of nitrogen gas (N2) was reacted, generating a yield of 20%. What was the mass obtained from ammonia?

    asked on November 27, 2018
  7. chemistry

    Nitromethane (ch3no2) burns in air to produce significant amounts of heat. 2ch3no2(l)+3/2o2(g)→2co2(g)+3h2o(l)+n2(g) δhorxn = -1418 kj part a how much heat is produced by the complete reaction of 4.68 kg of nitromethane

    asked on November 17, 2018
  8. chemistry

    What is the concentration of a potassium iodate solution after you complete the following porcedure? Pipette 10 mL of a 0.31 M potassium iodate stock solution to a 100-mL volumetric flask and then add water to the mark.

    asked on November 6, 2018
  9. chemistry

    One mole of aluminum chloride (AlCl3), 26.98 grams of aluminum (Al), and 106.4 grams of chlorine (Cl). What is the percent composition of aluminum in aluminum chloride? A 3.700% B 20.22% C 25.40% D 79.81%

    asked on October 30, 2018
  10. chemistry

    a 5.29 g sample of impure sodiun chloride was dissolved and dihuted to a total volume of 250 0 ml. If 25.0 mL of the sodium chloride solation required 28.5 ml, of 0 300 M AgNO3, solution to reach the equivalence point, using chromate indicator, what was

    asked on October 29, 2018
  11. chemistry

    Determine the number of moles of calcium carbonate with 10% impurities, which reacts with 21.9 g of hydrochloric acid.

    asked on October 29, 2018
  12. chemistry

    A 10 ml of hydrochloric acid solution of concentration equal to 0.1 mol per litre is added 90 ml of pure water. What's the pH of the final solution?

    asked on September 16, 2018
  13. chemistry

    A 0.01 M solution of a HBrO is 4.0% ionized. is the PH value of this acid? (Log4 = 0.6)

    asked on September 10, 2018
  14. chemistry

    n order to determine the concentration of bivalent nickel in environmental samples we can use the complexometric titration. A 100 mL sample containing Ni2 + was treated with 50 mL of 0.02 mol / L EDTA solution complexing all Ni2 + solution and leaving an

    asked on August 30, 2018
  15. chemistry

    Calculate the amount of hydrogen atoms in 0.75 mol of water molecules

    asked on August 30, 2018
  16. chemistry

    A solution was prepared with 100 ml of 0.1 mol/L acetic acid and 100 ml of 0.1 mol/l sodium acetate. The density of acetic acid is 1.05 g/mL Calculate the required volumes of each to prepare 25 mL of a buffer solution PH = 5.0. and calculate the PH. Data:

    asked on August 25, 2018
  17. chemistry

    Calculate the oxalic acid mass required for neutralization of 25 ML of 0.1 M NaOH solution.Dihydrate Organic Diacid (H2C2O4.2 H2O, molar mass = 126.04 g/mol)

    asked on August 23, 2018
  18. chemistry

    Consider the titration of 20.00 ML of KOH 0.01 mol/L with HNO3 0.01 mol/L. Calculate the PH of the titration solution after the addition of the following titration volumes: A. 0.00 ml C. 20.00 ml B. 19.99 ml D. 25.00 ml

    asked on August 23, 2018
  19. chemistry

    Calcium carbonate and sulfuric acid react according to the balanced reaction. CaCO3+ H2SO4 = CaSO4 + CO2 + H2O Starting from 300 grams of calcium carbonate with 3% impurities, what is the mass of calcium sulfate formed considering that the reaction is 90%

    asked on August 20, 2018
  20. chemistry

    What is the volume of solvent needed for the preparation of an equal 10% title solution when using 15 mL of solute?

    asked on August 17, 2018
  21. chemistry

    A galvanic cell with e o cell = 0.30 v can be constructed using an iron electrode in a 1.0 m fe(no3)2 solution, and either a tin electrode in a 1.0 m sn(no3)2 solution, or a chromium electrode in a 1.0 m cr(no3)3 solution even though sn2+/sn and cr3+/cr

    asked on August 12, 2018
  22. chemistry

    A chemist added 3.15 grams of HNO3 to a solution of the same acid with concentration of 9 mol/L. dilutes the resulting solution up to the 100ml volume. The resulting solution will have what concentration?

    asked on August 11, 2018
  23. chemistry

    You have a 250ppm solution of K with KCl, you want to prepare a 0.00100 mole of Cl, how many mililiter should be diluted to prepare 1 liter of solution

    asked on August 10, 2018
  24. chemistry

    How many electrons contain the ion that has 13 protons 10 electrons and 15 neutrons?

    asked on July 30, 2018
  25. Human Capital

    As a manager, explain the importance of understanding the controllable and uncontrollable financial affects on a business environment. What can you do to limit these financial constraints? What are some of the high cost items from a human resources

    asked on March 12, 2010
  26. Management

    1. Select a consumer item available today and analyze it using the four Ps of marketing. How do these factors impact consumers? What are some things that influence marketers? What influences consumers to buy a product? 2. Discuss two products with which

    asked on February 16, 2010
  1. chemistry

    thank you so much :)))

    posted on August 23, 2018
  2. chemistry

    0.97% ??

    posted on August 23, 2018
  3. chemistry

    thank u

    posted on August 10, 2018
  4. Chemistry

    pH increases exponentially. Thus, smaller amounts of metal will make greater differences in H3O+ present as metal is added.

    posted on November 17, 2015
  5. PSSA

    why do we have to take the pssa

    posted on April 25, 2012
  6. Human Capital

    As a manager, explain the importance of understanding the controllable and uncontrollable financial affects on a business environment. What can you do to limit these financial constraints? What are some of the high cost items from a human resources

    posted on March 12, 2010