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A buffer contains significant amounts of a weak acid and a salt containing its conjugate base. The acid consumes any added base, and the base consumes any added acid. In this way, a buffer resists pH change. Strong acids, strong bases, two bases, or two acids cannot form a buffer on their own.
Which set of compounds would form a buffer in aqueous solution?
State which one is a buffer or not a buffer:
a) NaCl and KCl
b) HCN and NaF
c) NaBr and KBr
d) HCOOH and HCOOK
e) KF and KOH
f) HBr and NaBr
g) HCN and KCN
Statements correctly describe(s) the relationship between the structure of a fatty acid and its melting point? a. Saturated fatty acids have melting points that increase gradually with molecular weight.
A sample of a gas occupies a volume of 323 mL at 625 torr. At constant temperature, what will be the new volume when the pressure changes to the following:
At 25 degree C the heat of fusion of Al is 10.6 kJ/mol and the heat of sublimation is 326.4 kJ/mol. What is the heat of vaporization of Al at 25 degree C.
A sample of gas is collected over water at 14 degrees Celsius. The pressure of the resultant mixture is 113.0 kPa. What is the pressure exerted by the hydrogen alone?
Describe how chemical labeling and crystal structures can be used to determine residues important
The standard Gibbs-free energy of a system is related to its equilibrium constant through the following equation.
The free radical chlorination of isobutane at 25C yields 64% isobutyl chloride and 36% tert-butyl chloride. However, free radical bromination of the same compound at 127C yields only trace amounts of isobutyl bromide and 99% of tert-butyl bromide
In the preparation of the esters given in this experiment, the reaction product was extracted with 5% sodium bicarbonate solution in the isolation step. Why? What gas was evolved during this washing step? Write a balanced equation for the reaction..
For each species listed, indicate the hybrid orbital set (sp2, sp3d, etc) employed by the central atom
What is the minor product? Explain why the one product is formed preferentially over the other. What reaction conditions can you change to favor the formation of the minor product?
Explain the difference in the answers to question 2 and question 5. Which is the "correct" value for the concentration of the standard NaOH solution? Why?
Every antacid contains one or more ingredients capable of reacting with excess stomach acid (HCl). The neutralization products (among others) are CO2 and/or HO2. Write net ionic equations to reprsent the neutralizing action of the following antaci..
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