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Explain a solution is to be prepared with a sodium ion concentration of 0.529 mol/L. Explain what mass of sodium sulfate (g) is needed to prepare 1.54 liters of such a solution?
calculate the volume in mililiters (mL) of 6 M NaOH needed to make 500 mL of a 0.100 molar (M) NaOH solution.
If the concentration of an acid in solution is 2.2 times larger than the concentration of its conjugate base, and the pH of the solution is 3.5, what is the pKa of the acid?
the enzyme acetylcholinesterase,which has a turnover rate of 25,000 s-1. Calculate how long it takes the enzyme to cleave one acetylcholine molecule.
Recommend an explanation why the cyclic intermediate might have two important groups in a trans relationship that could factor the E-alkene.
Give two reasons why the product is concentrated in the distillation flask during a continuous solid-liquid extraction. 2) what difficulties may be encounter during the determination of the melting point of caffeine?
Hard water deposits are largely CaCO3. Propose a way to remove these deposits from plumbing fixtures.
How many moles of each of the following were in the original sample?
Dissolved in water to produce a 0.0170 M solution. The pH of the resulting solution is 2.33. Calculate the Ka for the acid.
A student is required to prepare 25.0 mL of ethanol using a sucrose fermentation technique. How many mL of carbon dioxide can be expected to fill a balloon used as a trap in the fermentation
43 kg person drinks 410. g of milk, which has a "caloric" value of approximately 3.0 kJ/g. If only 18% of the energy in milk is converted to mechanical work.
calculate the mass of vapour present in a room of volume 250 meter cube that contains air at 23 degree centigrade on a day when the relative humidity is 53 per cent.
Write the half-reactions that occur in the two electrode compartments. (Type your answer using the format [Ag] for Ag and Ag for Ag. Also, the first box gets the coefficient)
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