Question

How many grams of oxalic acid dihydrate are needed to prepare 100.mL of a .200N solution (0.200 equivalents of acid per liter of solution)?

Answer #1

A buffer prepared by dissolving oxalic acid dihydrate
(H2C2O4·2H2O) and disodium oxalate (Na2C2O4) in 1.00 L of water has
a pH of 5.043. How many grams of oxalic acid dihydrate (MW = 126.07
g/mol) and disodium oxalate (MW = 133.99 g/mol) were required to
prepare this buffer if the total oxalate concentration is 0.195 M?
Oxalic acid has pKa values of 1.250 (pKa1) and 4.266 (pKa2).

If you had added 50 mL of water to dissolve the oxalic acid
dihydrate instead of 30 mL, would that require more, less, or the
same amount of NaOH solution to titrate? Explain

Calculate the concentration of an oxalic acid (H2C2O4) solution
if it takes 34.0 mL of a 0.200 M NaOH solution to consume the acid
in 25.0 mL of the oxalic acid solution. The net ionic equation of
the titration reaction is: H2C2O4(aq) + 2
OH– (aq) --> C2O42–(aq) + 2 H2O(l)

How many grams of dextrose are needed to prepare 500 mL of a
17.5% solution? 1. Show your work using dimensional analysis. 2.
Write a sentence that puts your answer into the context of the
problem.

How many grams of solid Na2CO3 and solid NaHCO3 are needed to
prepare 600 mL of 250 mM bicarbonate buffer at pH = 4.5? Carbonic
acid has two pKa values at 3.77 and 10.20

How much NaOH (in grams) is needed to prepare 921 mL of
solution with a pH of 10.405?
g NaOH

(a) How many milliliters of 0.1490 M KMnO4 are needed to react
with 131.0 mL of 0.1490 M oxalic acid?
______ mL
(b) How many milliliters of 0.1490 M oxalic acid are required to
react with 131.0 mL of 0.1490 M KMnO4?
_______ mL

How many ml of 20% solution and how many ml of sterile water are
needed to prepare 500 ml of 2% solution?

How many grams of glyoxylic acid and sodium glyoxylate are
needed to prepare 2.00 L of a 1.30 M buffer at pH 4.00? The pKa of
glyoxylic acid is 3.34. Note: Use the monohydrate forms,
HCOCO2H·H2O and HCOCO2Na·H2O.

How many mmols of Tris would you need to prepare 100 mL of a
100mM Tris solution?
How many grams of Tris (MW 121.1) would you need ot prepare 100
mL of a 100 mM Tris solution?

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