a. What is the pH of a 0.25 M lactic acid (CH3(CH2)COOH)
solution? Known: pKa = 3.85
I set the equation up as CH3(CH2)COOH –> CH3(CH2)COO- + H3O+. My
final answer I got was pH = 3.99.
b. Assume you had enough solid sodium lactate (NaCH3CH(OH)COO)
to cause the lactate ion (CH3CH(OH)COO-) concentration in the
solution to increase to 0.20 M. what is the pH of the solution
after the addition of sodium lactate to lactic acid?
I have no idea what to do with this one, but I’m assuming Na is a
spectator ion?
Please show the work necessary for part b, and part a if my answer is incorrect. Thanks.
In: Chemistry
Isopropyl alcohol is composed of C , H and O combustion of
0.255g of isopropyl alcohol produces 0.561g of co2 and 0.306g of
h2o . Determine empirical formula of isopropyl alcohol Cx Hy Oz ?
?
Please I need the answer with explantion ^_^
In: Chemistry
Calculate the pH for each of the following cases in the titration of 25.0 mL of 0.140 M pyridine, C5H5N(aq) with 0.140 M HBr(aq): (a) before addition of any HBr (b) after addition of 12.5 mL of HBr (c) after addition of 23.0 mL of HBr (d) after addition of 25.0 mL of HBr (e) after addition of 31.0 mL of HBr
In: Chemistry
The pH of buffer solutions.
Weight of NaC2H3O2*3H2O =3.47g
pH of original buffer soution = 4.53
pH of buffer + HCl = 3.94
pH of buffer + NaOH = 5.00
Additional details: approximately 8.8 mL of 3M acetic acitd was added to the 3.47g of NaC2H3O2*3H2O. And approximately 56.0mL of distilled water. (This makes the buffer solution) This solution was then split in half. To one half 1 mL of 3M HCl was added. To the second half 1mL of 3M Na OH was added.
Calculate the pH of buffer.
Calculate the pH of buffer + HCl
Calculate the pH of buffer + NaOH
Please show all calculations and work.
please help me. I confused
In: Chemistry
A fictional company has been producing propene oxide, C3H6O, from propene, C3H6, with a 96.0% yield. The process requires the use of a compound called m-chloroperoxybenzoic acid, C7H5O3Cl, which can be abbreviated as mCPBA. The entire reaction takes place in the solvent dichloromethane, CH2Cl2:
C3H6+C7H5O3ClCH2Cl2−−−⟶96.0% yieldC3H6O+C7H5O2Cl
The initial propene concentration in the solvent is 21.0 g/L.
Consider the prices of the following substances.
| Substance | Price per unit | Unit |
| propene | $10.97 | kg |
| dichloromethane | $2.12 | L |
| mCPBA | $5.28 | kg |
| propene oxide | $258.25 | kg |
Also consider that the cost of waste disposal is $5.00 per kilogram of propene oxide produced.
A relatively simple way of estimating profit is to consider the the difference between the cost (the total spent on materials and waste disposal) and the earnings (the price at which the product can be sold).
Calculate the profit from producing 26.00 kg of propene oxide.
In: Chemistry
Calculate (a) the saturation magnetization and (b) the saturation flux density for nickel, which has a density of 8.90 g/cm3. Solve by deriving the various equations step-by-step
In: Chemistry
While you might improve the trimystrin yield by changing the solvent, what untended consequence might also occur? (deals with recrystallization of nutmeg)
In: Chemistry
Calculate the pH of the solution after the addition of the following amounts of 0.0656 M HNO3 to a 50.0 mL solution of 0.0750 M aziridine. The pKa of aziridinium is 8.04. a) Volume of Hno3 equal to half the equivalence point volume b)53.7mL of HNO3 c) Volume of Hno3 equal to the equivalence point
In: Chemistry
In: Chemistry
In: Chemistry
Determine the [OH?] of a solution that is 0.100M in F- also find the pH of this solution
I get 1.2*10^-6 but it's not right. for the [OH]
In: Chemistry
Please explain questions are on finals and really need to understand the process.
If a solution containing 45.156 g of mercury(II) chlorate is allowed to react completely with a solution containing 14.334 g of sodium sulfate, how many grams of solid precipitate will be formed?
How many grams of the reactant in excess will remain after the reaction?
In: Chemistry
for the reaction pcl5(g) ------ pcl3(g)+cl2 (g)
K = 0.050 at 150 C. A quantity of pcl5 is placed in a 5 liter container at 150 C when equilibrium is established, the container holds 0.50 moles of cl2. How many moles of pcl5 were originally placed in the container?
In: Chemistry
Why do phospholipids form a lipid bilayer rather than micelles in water? What are the thermodynamic driving forces (considering enthalpy and entropy) for this structure?
In: Chemistry