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a) How would you prepare a 250 ml solution, 0.5 M in sodium phosphate buffer at pH of 7.0. You have in the laboratory monobasic sodium phosphate (NaH2PO4) and diabasic sodium phosphate (Na2HPO4). pKa = 7.2
b) Describe how you would prepare the above buffer solution if you only had NaH2PO4, and a solution of NaOH. What other equipment would you need?
A solution of ammonia and water contains 1.50×1025 water molecules and 5.50×1024 ammonia molecules. How many total hydrogen atoms are in this solution?
At equilibrium the concentration of NO in the vessel is 0.161M. At equilibrium the vessel contains N2, H2O and H2. What is the value of the equilibrium constant Kc for the following reactions
Calculate the work energy, w, gained or lost by the system when a gas expands from 15 L to 35 L against a constant external pressure
Find the confidence limit (95% confidence level), true value (from literature), absolute error, and relative error).
A 1.00 g sample of an unknown acid required 17.0 mL of .650 M NaOH to neutralize. What is the molar mass of the unknown acid?
An amount of lactic acid is dissolved in water and the reaction is allowed to reach equilibrium. The concentration of the protonated acid is found to be 2.5 M.
These two solutions will be added together into a beaker to create one solution. Adding them together cause them to dilute each other. Calculated the new molarity of HX. Give your answer to four decimal places.
For each pair of compounds below, indicate the more reactive in the type of mechanism specified. Briefly state why. Explain the smallest molecular dipole moment
Common oxidation states of mercury are 1 and 2. In the 1 oxidation state, mercury forms a diatomic cation. In the 2 oxidation state, mercury is a typical monatomic cation.
is added to the flask so that the total volume of solid and liquid together is 54.00 . The solid and toluene together weigh 58.58 . The density of toluene at the temperature of the experiment is 0.864
If 43.2 ml of 0.105 M KMnO4 were required to reach the endpoint of a 14.8g bleach sample, what was the perrcentage of H2O2 in the sample?
A balloon of methane gas, CH4, has a temperature of - 2.0 Degrees Celsius and contains 2.35 g of the gas. What is the temperature of the gas in kelvins
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