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Prelab Assignment for Lab - Buffer Capacity
1) Describe what a buffer consists of and what purpose it serves.
2) A student adds 3.0 mL of 0.50 M acetic acid and 7.0 mL of 0.50 M sodium acetate to a beaker and then adds 90.0 mL of water. Calculate the pH of this buffer using the Henderson-Hasselbalch equation.
3) Calculate the pH of a buffer prepared the same way as in question 2, but with 7.0 mL of 1.0 M sodium acetate instead of 0.50 M sodium acetate.
A sample of gas occuplies a volume of 62.7 mL. As it expands, it does 120.3 J of work on its surroundings at a constant pressure of 783 torr. What is the final volume of the gas
0.498g sample of sodium carbonate requires 23.5 mL of a sulfuric acid solution o reach the end point for the reaction.
The local Hair Cuttery is a beauty parlor / hair cut establishment operating in a monopolisticallycompetitive industry in longrun equilibrium. The manager notes that each day, not all of the chairs inthe establishment are full. One option would be to..
A solution is made by mixing 40.0 mL of ethanol, C2H6O, and 60.0 mL of water. Assuming ideal behavior, what is the vapor pressure of the solution at 20 °C
1. explain what happens to pressure on the molecular level when the number of moles of gas is increased at constant
The molar mass of cellulose is approximately 6.0 x 105 g/mol and the molar mass of a soluble starch is on the order of 4.0 x 103 g/mol. The monomer unit in both of these molecules has the emperical formula C6H10O5
What is resonance energy? Explain taking the example of benzene. What do you understand by para-directing activators, para-directing deactivators and meta-directing deactivators?
A liquid is in equlibrium with its vapor. If a small amount of the vapor escapes, what is the largest immediate result. a- vapor rate decrease b- condensate rate decrease
Given the following percent composition, what is the molecular formula? 40%C, 6.7% H, 53.3% O
Use line notation to represent the electrochemical cells for each of the following overall redox reactions
what would be the effect on my calculated molecular weight of p-dichlorobenzene if my lab partner left the stopper off of the apparatus while I was weighing the solid p-chlorobenzene. Explain in detail what would happen if this occured and how it ..
Write the complete formula equation for the reaction, where ionic species are written as NaCl(aq) rather than Na+(aq) + Cl-(aq), using the smallest integer coefficients, including symbols for states of matter.
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