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a. You have 50 mL of a buffer solution that is 0.15 M in HA and 0.25 M in A-. Calculate the pH of the solution after you add 100 mL of 0.01 M HCl to the solution. The pKa of HA is 4.75. b. You wish to prepare 100 mL of a buffer solution that is 0.025 M in carbonic acid (H2CO3). The pKa of H2CO3 is 6.351. Calculate the amount of H2CO3, in grams, that you will need to weigh out. c. You wish to prepare 100 mL (total volume) of a buffer solution that is 0.025 M in carbonic acid, pH 7.25. You have solid H2CO3 and solid NaHCO3. Calculate how many grams of H2CO3 and HCO3- you need to weigh out to prepare this solution. pKa=6.351
In the formation of the glyptal resin, when the reaction appears to boil, what substance is actually boiling off. What is the purpose of the NaOH in the nylon experiment
What is the change is volume when 1.00 mol of CH4 reacts with 2.00 mol O2? What is the w for this chnage? Calculate the change in internal energy, U, for the change indicated by the chemical equation
A 184-mg sample of Na2CO3 is dissolved in H2O to give 3.00L of solution. What is the concentration of Na+ in parts per million (ppm)?
Why is it necessary to remove the stopper from a reparatory funnel when liquid is being drained from it through the stopcock
2K(s)+2H2O(l)--> 2KOH(aq) + H2(g) A 5.00 g chunk of potassium is dropped into 1.00 kg water at 24 deg C. What is the final temperature of the water after the preceding reaction occur.
how many mol of CO2 are produced for every mol of pentene reacted. The chemical reaction is pentene + oxygen = carbon dioxide + water.
Consider the sublimation of mothballs at 27 C in a room having dimensions 7.5ft x 11.0ft x 7.1ft. Assume that the mothballs are pure solid naphthalene (density 1.16 g/cm3) and that they are spheres with a diameter
The first ionization energy of Bismuth is E_i1 = +703 kJ/mol. What is the longest possible wavelength of light that could ionize an atom of bismuth
Use Hess' Law to show how the titration of acetic acid with sodium hydroxide can be expressed as the combination of two reactions: the acetic acid reacting with water, and the sodium hydroxide reacting with hydronium ion.
the combustion of how many moles of ethane would be required to heat
Explain the differences between ionic bonding and covalent bonding, and how each type of bonding affects solubility, melting and boiling points, and reactivity of compounds. Include at least 2 examples of each and organize your information in a ch..
Problem- CuS(Ksp=8.7*10^-36) is the least soluble of the group II sulfides while PbS(Ksp+8.4*10^-28) is much more soluble. Consider a solution saturated in H2S (0.10 M) and 0.30 M HCl
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