The toxic effects of ingesting methanol can be reduced by administering ethanol. The ethanol acts as a competitive inhibitor of methanol by displacing it from LADH. If an individual has ingested 50 mL of methanol, how much 100 proof whiskey (50% ethanol by volume) must be imbibed to reduce the activity (Vo) of his LADH towards methanol to 3% of its original value? The adult human body contains ~40L of aqueous fluids throughout which ingested alcohols are rapidly and uniformly mixed. Assume the concentration of methanol in the body is 18mM and whiskey is 6.5M ethanol. Assume the KM values of LADH for ethanol and methanol to be 10-3 M and 10-2 M, respectively, and that Ki = KM for ethanol.
In: Chemistry
Calculate the pH for each of the following cases in the titration of 50.0 mL of 0.110 M HClO(aq) with 0.110 M KOH(aq). The ionization constant for HClO (4.0x10^-8) I need answers for each one. Thanks!
(a) before addition of any KOH
(b) after addition of 25.0 mL of KOH
(c) after addition of 35.0 mL of KOH (
d) after addition of 50.0 mL of KOH
(e) after addition of 60.0 mL of KOH
In: Chemistry
|
To prepare a 0.400 M NaCl solution, add _______ of NaCl and enough water to form a solution with a volume of _______ in a volumetric flask. |
answer is 5.84 g, 250 mL
In: Chemistry
An aqueous solution containing 5.26 g of lead(II) nitrate is added to an aqueous solution containing 7.33 g of potassium chloride.
Enter the balanced chemical equation for this reaction. Be sure to include all physical states.
balanced chemical equation:
What is the limiting reactant?
lead(II) nitrate
potassium chloride
The percent yield for the reaction is 84.1%84.1%. How many grams of the precipitate are formed?
precipitate formed:
How many grams of the excess reactant remain?
excess reactant remaining:
In: Chemistry
We have seen from our study of acid/base chemistry that the presence of a weak base such as ammonia (Kb = 1.8 X 10-5) can affect the pH of an aqueous solution. This pH can in turn affect the solubility of a metal hydroxide salt as a result of the common ion effect. The Ksp for gallium hydroxide = 7.28 X 10-36. What is the molar solubility of gallium hydroxide in a 3.00M solution of ammonia?
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If Kc = 4.4 x 10^-2 for PCl3(g) + Cl2(g) ⇄ PCl5(g) at 520 K, what is the value of Kp for this reaction at this temperature? Express your answer using two significant figures.
In: Chemistry
Analysis of Group 1 Cations
1) Explain what you would do to prove that a solution contained mercury(I) ion.
2) You are given a white solid and told that it is either strontium nitrate or lead(II) nitrate. Explain what you would do to determine the identity of the solid.
3) You are told that an acid is either hydrochloric acid or nitric acid. What simple test could you carry out to tell which acid it is?
4) You are given a solution and asked to determine which group I cations are present in it. Addition of hydrochloric acid results in the formation of a precipitate. The precipitate is washed with hot deionized water. When the filtrate from hot water washing is tested with potassium chromate solution, a precipitate forms. When a solution of ammonia is added to the remaining precipitate from the addition of HCL, it completely dissolves. What do you conclude?
5) A yellow solid is either lead(II) chromate or sodium chromate. What would you do to tell which compound the solid is?
6) Givee an example of a group(IV) cation in the qualitative series.
In: Chemistry
Based on the addition of NaOH to water, describe why buffers are important in biological systems?
In: Chemistry
Consider the titration of 100.0 mL of 0.500 M CH3NH2 by 0.250 M HCl. (Kb for CH3NH2 = 4.4×10-4) Part 1 Calculate the pH after 0.0 mL of HCl added. pH = Part 2 Calculate the pH after 25.0 mL of HCl added. pH = Part 3 Calculate the pH after 80.0 mL of HCl added. pH = Part 4 Calculate the pH at the equivalence point. pH = Part 5 Calculate the pH after 300.0 mL of HCl added. pH = Part 6 At what volume of HCl added, does the pH = 10.64? mL
In: Chemistry
1-Compared to X-rays, AM radio waves
a. are more energetic.
b. are just as energetic.
c. are not a form of electromagnetic radiation.
d.are not a form of electromagnetic radiation.
2-Compared to AM radio waves, gamma rays .
a. are more energetic.
b. are just as energetic.
c. are not a form of electromagnetic radiation.
d.are not a form of electromagnetic radiation.
3-Compared to radio waves, sound waves
a. are more energetic.
b. are just as energetic.
c. are not a form of electromagnetic radiation.
d.are not a form of electromagnetic radiation.
In: Chemistry
A sample of 37Ar undergoes 8540disintegrations/min initially but undergoes 6990disintegrations/min after 10.0 days. What is the half-life of 37Ar in days?
t 1/2= ? days
In: Chemistry
Problem 16.63
Calculate the percent ionization of hydrazoic acid (HN3) in solutions of each of the following concentrations (Ka is given in Appendix D in the textbook).
Ka=1.5*10-9
Part B
0.113 M.
%=
Part C
4.30*10-2
%=
In: Chemistry
K2SO4(aq) + AgNO3(aq) → Ag2SO4(s) + KNO3 (aq)
a Balance the reaction.
b. Given that you have a 1.75 L solution of 0.170 M K2SO4 and a 2.00 L solution of 0.110 M AgNO3, calculate the amount in grams of precipitate formed. Show work
c.Calculate the concentration of SO2− ions left after the reaction has been completed
precipitate formed. show work
In: Chemistry
What are the differences between alkenes and alkynes? What are the differences between cis- and trans-isomers? How are cistrans isomers used for night vision?
In: Chemistry