4. Calcu late the volume of IM acetic acid required to prepare 100 mL of 0.5M...
2. How many ml of a 50% w/v acetic acid solution are required to prepare 1 L of 5% w/v acetic acid? 3. How many ml of concentrated HNOs are required to prepare 2L of 0.15N HNOs? 4. How many milliliters of a stock solution of 20% w/v NaOH are required to prepare 800 ml of a 2.5% w/v solution? 5. Suppose that you start with a 5X solution A and you want a final volume of 10 microliters of...
3. You need 6 mL of a chloroform-methanol-acetic acid 100:2:2 mixture How would you prepare a convenient volume of this mixture without too much leftover? Record these volumes in step 9 of the procedure so that you have them during lab. mL chloroform+ mL methanol + mL acetic acid
100 mL buffer solution (pH=5) being prepared using 5 mL of 0.5M acetic acid solution. 1. Calcualte the concentration of acetic acid [HA] in the final 100 mL: 2. Use the Henderson -Hesselbalch equations and solve for unkown: 3. Calculate the moles a A- needed to obtain this concetntration in 100 mL. 4. Calculate the mass of NaA needed to obtain this number of moles: 5. Calculate a 100 mL buffer solution (pH=5) being prepared using 5 mL of a...
You are asked to prepare 500. mL of a 0.100 M acetate buffer at pH 5.00 using only pure acetic acid (MW=60.05 g/mol, pKa=4.76), 3.00 M NaOH, and water. Answer the following questions regarding the preparation of the buffer. 1. How many grams of acetic acid will you need to prepare the 500 mL buffer? Note that the given concentration of acetate refers to the concentration of all acetate species in solution. 2. What volume of 3.00 M NaOH must...
Each group of students should prepare 100 mL of ONE of the following PAIRS of buffers 2. Phosphate buffer a. 100 mM potassium-phosphate, pH 5.0 b. 100 mM potassium-phosphate, pH 7.0 To prepare 100 mL of 100 mM phosphate buffers by titrating the monobasic form with base, first calculate how much KH2PO4 you need. Dissolve this amount in 50 mL of water. Using the Henderson-Hasselbalch equation, calculate how much 1 M NaOH should be required to achieve the desired pH...
You will be using a mixture of 5:1:4 volume ratio of butanol, glacial acetic acid (pure acetic acid), and water in this lab. Assume that butanol is the same as water in terms of a pH calculation. The density of acetic acid is 1.05 g/ml. The molecular weight of acetic acid is 60.05 g/mol. The Ka of acetic acid HAc is 1.8*10^-5. You can make the assumption that [H+] = [Ac-] << [HAc] here. What is the pH of this...
You need to prepare an acetate buffer of pH 6.29 from a 0.704 M
acetic acid solution and a 2.48 M KOH solution. If you have 575 mL
of the acetic acid solution, how many milliliters of the KOH
solution do you need to add to make a buffer of pH 6.29? The pKa of
acetic acid is 4.76.
You need to prepare an acetate buffer of pH 6.29 from a 0.704 M acetic acid solution and a 2.48 M...
You have 775 mL of an 0.15 M acetic acid solution. What volume (V) of 1.80 M NaOH solution must you add in order to prepare an acetate buffer of pH = 4.65? (The pKa of acetic acid is 4.76.)
You have 125 mL of an 0.19 M acetic acid solution. What volume (V) of 1.10 M NaOH solution must you add in order to prepare an acetate buffer of pH = 4.20? (The pKa of acetic acid is 4.76.)
You have 775 mL of an 0.49 M acetic acid solution. What volume (V) of 2.40 M NaOH solution must you add in order to prepare an acetate buffer of pH = 4.56? (The pKa of acetic acid is 4.76)