Tris- hcl buffer is often used as a buffer for biochemical reactions in ph range from 7.1 to 9.1. it is made by dissolving in water tris (hydroxyl methyl) amino methane, a weak base, and then adding hcl. the conjugate acid-base pair for tris is (hoch2)3 c-nh3 + (here trish+ ) and (hoch2)3 c-nh2 (here tris base): its equilibrium is (hoch2)3 c-nh3 + ↔ (hoch2)3 c-nh2 + h+ pka= 8.08 (at 25 o c) assume you have to prepare 200 ml of the buffer. to do so you take 100 ml of 0.1 m tris base, add hcl and then adjust the volume with pure water. how many ml of 0.1 m hcl you have to add to it in order to have the final ph of ph = 8.0?
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Chemistry, 22.06.2019 07:00
Achemist wants to extract copper metal from copper chloride solution. the chemist places 0.50 grams of aluminum foil in a solution containing 0.75 grams of copper (ii) chloride. a single replacement reaction takes place. (ii) chloride. a single replacement reaction takes place. which statement explains the maximum amount of copper that the chemist can extract using this reaction? a) approximately 0.36 grams, because copper (ii) chloride acts as a limiting reactant b) approximately 1.8 grams, because copper (ii) chloride acts as a limiting reactant c) approximately 0.36 grams, because aluminum acts as a limiting reactant d) approximately 1.8 grams, because aluminum acts as a limiting reactant
Answers: 3
Chemistry, 22.06.2019 09:00
Scientific evidence tells us that the cause of earths four season is the tilt of earth as it revolves around the sun. the student is instructed to illustrate this information in a science notebook. how will the student illiterate winter in the northern hemisphere?
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Chemistry, 22.06.2019 12:20
Achemistry student weighs out 0.306 g of citric acid (h3c6h5o7), a triprotic acid, into a 250 ml volumetric flask and dilutes to the mark with distilled water. he plans to titrate the acid with 0.1000 m naoh solution. calculate the volume of naoh solution the student will need to add to reach the final equivalence point. be sure your answer has the correct number of significant digits.
Answers: 3
Tris- hcl buffer is often used as a buffer for biochemical reactions in ph range from 7.1 to 9.1. it...
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