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Describe the preparation of a 1.50 M, pH 8.0 tris buffer (500 mL) using tris base (MW= 121.1 g/mol) and 3.0 M HCl. pKa of tris is 8.3
using a chemical test or tests, how could you distinguish between 3-pentanone and 4-penten-1-ol?
Calculate the hydrogen-ion concentration [H+] for the aqueous solution in which [OH-] is 1 x 10-11 mol/L. Is this solution acididc, basic, or neutral?
Two of the following ions depend on their conversion into a gas for detection. What are the 2 ions? The two ions will form an ionic compound.
The relative sweetness of sucralose is 60000. The relative sweetness of sugar is 100. How many grams of sucralose would you need for a solution that has the same sweetness as one made with 2.00g of sugar
Recrystallization from 95% ethanol gave yellow crystals. What is the overall mechanism for this reaction including all arrows, the identification of the electrophile and nucleophile, and all charges?
Which os the dollowing statements is correct concerning the equivalence point in a titration of a weak acid (HA) by a strong base? The pH is less than 7 because HA is a weak acid
Determine the enthalpy change if The heat released when 24.9 grams of Potassium K reacts with excess H2O water is 124 kilo joules?
The mass of the flask (before the sample is placed into the flask) is measured when the outside of the flask is wet. However, the outside of the flask is dried before its mass is measured.
HClO is a weak acid (Ka = 4.0 × 10-8) and so the salt NaClO acts as a weak base.
How much time is required to produce 200g of aluminum metal from molten aluminum oxide dissolved in cryolite, if you use a 12amp current
An empty flask's mass is 17.4916g, its mass is 43.9616g when filled with water at 20.0c (d=0.9982g/ml). The density of "heavey water" at 20c is 1.1053g/ml. What is the mass of the flask when filled with heavy water at 20.0c
An oligomeric protein has a molecular weight of 168000. A 420 mg sample was treated with an excess of 1-fluoro-2,4-dinitrobenzene (Sanger\'s reagent) until the reaction was complete
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