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As a technician in a large pharmaceutical research firm, you need to produce 200 mL of 1.00 M a phosphate buffer solution of pH = 7.06. The pKa of H_2PO_4}^- is 7.21. You have 2.00 L of 1.00 M KH_2PO_4 solution and 1.50 L of 1.00 M K_2HPO_4 solution, as well as a carboy of pure distilled H_2O.
How much 1.00 M KH_2PO_4 will you need to make this solution?
The blue color of dextran blue solution is due to the well-known, blue complex formed between starches and iodine. If you only had the absorption spectrum of this solution
The pH of a bicarbonate-carbonic acid buffer is 8.00. Calculate the ratio of the concentration of carbonic acid (H2CO3) to that of the bicarbonate ion (HCO3-).
Identify the spectator ions present when the following are mixed. Include aggregation states. If there are no spectator ions, say none.
A patient has 48 ml. of blood drawn and this volume of blood has a mass of 39.5 g. what is the specific gravity of the blood?
Air coming from a painting operation contains 10.0 wt% acetone. The total flow rate of the air/acetone stream is 1.00x103 lbm/min. This stream is sent to a scrubbing system where it is mixed with water.
What is the initial concentration (in M) when 17.8 mL of a iron(lll) chloride solution was diluted with 15.3 mL of solvent to a final concentration of 0.725 M? Assume the volumes are additive.
What is the formula weight of KI? What quantity of KI is present in 301 mL of a 0.30 M solution?
What was the calculated PH value obtained for the reaction NH3 + HCl -› NH4Cl using the thermodynamic data NaOH (aq) + HCl (aq)--> H2O(l) +NaCl (aq) NaOH (aq) + NH4Cl(aq)---> NH3 + NaCl + H2O(l) NH4Cl 2M 20ml NH4OH 2M 10ml HCL 2M 20ml NaOH 2M 20ml
What is the rate constant of a first-order reaction that takes 288 seconds for the reactant concentration to drop to half of its initial value?
Get a glass and fill it with cold tap water. Observe the water in the glass as it warms to room temp. What effect does temp have on the amount of gas that can remain dissolved in water? Can you use this information to explain boiling?
If you fill the larger tank with oxygen to a pressure of 155 atm, to what pressure should you fill the acetylene tank to ensure that you run out of each gas at the same time? Assume ideal behavior for all gases.
You are given an acid with an equivalent weight of 62.5 g. What is the average molecular weight if the acid is diprotic? a) How many grams of your acid are needed to make 150mL of a .750 N (normal) solution?
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