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You are working on an expiriment with a newly discovered enzyme. This enzyme works most efficienly at a pH of 5.70. You make 250mL of a 150 mM acetate buffer (pKa=4.76), pH 5.70. The stock concentrations of the acetic acid and sodium acetate used to make the buffer are 1 M for each.
a) Was this buffer a good choice for this reaction? Explain
b) What is the concentration of the acid and base form of acetic acid when you start the experiment?
c) In the process of the enzyme catalyzed reaction, 5mM H+ is produced. What is the pH of the solution after the reaction is complete?
When photons with a wavelength of 310. nm strike a magnesium plate, the maximum velocity of the ejected electrons is 3.45 × 105 m/s.
In what ways might the one(s) that does (do) not have a metabolic energy source (caffeine) provide the perception of increased energy after consumption?
How many grams of copper are in the necklace? 3. If 18-karat gold has a density of 15.5 , what is the volume in cubic centimeters?
If 37.3g of CO2 is produced in the reaction of C2H2 with O2 to form CO2 and H2O, how many grams of H2O are produced?
What prefix is used to name a hydrocarbon with two carbon atoms?
Buffering Action of Proteins, We did this experiment in class but I want to see if the results seem reasonable and, if so, why they were not more varied.
How many moles of each of the following were in the original sample?
Describe the apparent relationship between H30+ and OH- concentrations when an endpoint is reached in an acid-base titration.
On the basis of your knowledge of bonding in liquids and solids, arrange the following substances in order of highest to lowest melting temperature: NaCl, Na, Cl2, SiO2.
Lakes that have been acidified by acid rain can be neutralized by liming, the addition of limestone (CaCO3 ). How much limestone in kilograms is required to completely neutralize a 3.8 x109 lake with a pH of 5.5.
Calculate the partial pressure of ozone and the number of ozone molecules per liter of air if the tempreture and pressure were 20.0 degrees C and 758 mmHg, respectively.
How many liters of water vapor can be formed by the reaction of 275.0 liters of oxygen gas and 250.0 grams of pentane? Which reactant is limiting? How many grams of the excess reactant are left over?
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