Question
In: Chemistry
Tartaric acid is a diprotic acid (H2T) present in many fruits and is used in cosmetics...
Tartaric acid is a diprotic acid (H2T) present in many fruits
and is
used in cosmetics due to its powerful depigmenting effect.
Therefore, it is
present in multiple facial creams whose pH is 5.2. Calculate the
amount of H2T that is
you must add to prepare 125 mL of a necessary tartaric acid
solution in the
manufacture of such creams. Data: Ka1 = 9.2 x 10-4; Ka2 = 4.31
x10-5. PM H2T = 150.1g / mol
Solutions
Expert Solution
Ans:-
First acid dissociation constant (ka1) of H2T is larger than second therefore solve for amount of H2T needed by considering ka1 only.
queen_honey_blossom answered 1 year agoRelated Solutions
Tartaric acid (“H2Tart”, M.W. = 176.13) is a diprotic acid that is important in food preparation....
Tartaric acid (“H2Tart”, M.W. = 176.13) is a diprotic
acid that is important in food preparation. (See McMurray & Fay
Appendix C for its Ka values.) A solution of tartaric acid is
produced by dissolving 2.90 g of H2Tart in 1.000 L of
water. What are the equilibrium concentrations of
H2Tart, HTart-, Tart2-,
and H+ in this solution?
Oxalic acid dihydrate is a solid, diprotic acid that can be used in the laboratory as...
Oxalic acid dihydrate is a solid, diprotic acid
that can be used in the laboratory as a primary
standard. Its formula is
H2C2O4
Many household cleaning products contain oxalic acid, H2C2O4, a diprotic acid with the following dissociation constants:...
Many household cleaning products contain oxalic acid, H2C2O4, a
diprotic acid with the following dissociation constants:
Ka1=5.9×10−2, Ka2=6.4×10−5Calculate the equilibrium concentration
of HC2O4− in a 0.20 mol L−1 solution of oxalic acid.
A white powder, consisting of a simple mixture of tartaric acid (C4H6O6) and citric acid (C6H8O7)...
A white powder, consisting of a simple mixture of tartaric
acid (C4H6O6) and
citric acid
(C6H8O7) was analysed to determine
the elemental composition. Combustion of a
495.3-mg sample produced 610.5 mg
of CO2 and 180.6 mg of
H2O.
Use atomic masses: C 12.011; H 1.00794; O 15.9994.
1) Calculate the % hydrogen, by mass, in the
sample.
2) Calculate the % oxygen, by mass, in the
sample
3)Calculate the % citric acid, by mass, in the
sample.
Sulfuric acid, H2SO4, is somewhat unique in that it is a diprotic acid but it is...
Sulfuric acid, H2SO4, is somewhat unique in that it is a
diprotic acid but it is also a strong acid. Thefirst dissociation
of H2SO4 is as a strong acid, and is thus a complete dissociation.
However, thesecond dissociation of H2SO4 is as a weak acid. Unlike
with other polyprotic acids, you cannotneglect the second
dissociation of H2SO4 because it will impact the pH of the
solution.
Determine the pH and the concentrations of all aqueous species
(H
+
, OH...
Carbonic acid, H2CO3, is a weak diprotic acid. In a 0.1 M solution of the acid,...
Carbonic acid, H2CO3, is a weak diprotic
acid. In a 0.1 M solution of the acid, which of the
following species is present in the largest amount?
H2CO3.
H3O+
HCO3
1. Tartaric acid is added to foods as an antioxidant and to impart its distinctive sour...
1. Tartaric acid is added to foods as an antioxidant and to
impart its distinctive sour taste. A chemist prepares a solution
that contains a formal concentration of 0.05 M. Phthalic Acid: pKa1
(HOOCCH(OH)CH(OH)COOH/HOOCCH(OH)CH(OH)COO-) = 2.89, pKa2
(HOOCCH(OH)CH(OH)COO-/-OOCCH(OH)CH(OH)COO-)) = 4.40,
a) Calculate the pH of the solution.
b) The chemist then takes 100.00 mL of the tartaric acid
solution and adds enough NaOH (0.10 M) solution to change the pH to
pH=4.00. Calculate the fraction of each of the species...
Oxalic acid (H2C2O4) is a diprotic acid that occurs in plants such as rhubarb and spinach....
Oxalic acid (H2C2O4) is a diprotic acid that occurs in plants
such as rhubarb and spinach.
Part A
Calculate the pH and the concentration of C2O2−4 ions in 0.27 M
H2C2O4 (Ka1=5.9×10−2; Ka2=6.4×10−5).
Part B
Express your answer using two significant figure
[C2O2−4] =
________M
Oxalic acid (H2C2O4) is a diprotic acid that occurs in plants such as rhubarb and spinach....
Oxalic acid (H2C2O4) is a diprotic acid that occurs in plants
such as rhubarb and spinach.
Calculate the pH (part A) and the concentration (part B) of
C2O2−4 ions in 0.12 M H2C2O4 (Ka1=5.9×10−2;
Ka2=6.4×10−5).
Malonic acid (H2M) is a diprotic acid. You wish to prepare a buffer of malonic acid...
Malonic acid (H2M) is a diprotic acid. You wish to prepare a
buffer of malonic acid (pKa1 = 2.847, pKa2= 5.696) with a final pH
of 2.90 but you only have disodium malonate (M2-) in your
laboratory shelf. You dissolve 100 mmol of this salt in 1 L of
water. Assume both dissociation processes are decoupled.
What is the initial pH of the solution? State any assumptions
you make.
How many equivalents of strong acid must you add to your...
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