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Tris(hydroxymethyl)aminomethane (or THAM) is a weak base frequently used to prepare buffers in biochemistry. Its pKb is 5.92. The corresponding pKa is 8.08 near the pH of physiological buffers, thus it exhibits good buffering capacity at physiological pH. What is the mass of THAM must be taken with 100mL of 0.50M HCl to prepare 1 L of a pH 7.40 buffer ?

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how can you seperate iron filling, sulfur, potassium chromate and aspirin. Please use the seperation of matter process I need this before thursday june 7, 2013

A compound 'A' is used in fire extingushion, as an ant acid and its small amount is also used in making bakery items.Identify the compound and explain the reason for above mentioned uses of compound 'A'

A 0.1645-g sample of an unknown monoprotic acid was dissolved in 16.7 mL of water and titrated with 0.0657 M NaOH solution. The volume of base required to bring the solution to the equivalence point was 18.9 mL.

After 10.1 mL of base had been added during the titration, the pH was determined to be 5.28. What is the Ka of the unknown acid? Molar mass of acid is 133 g/mol.

define folloing types of chemical reaction with example?

dedine chemical reaction and write the name of five type of chemical reaction?

if 0.5M h2so4 contains 50mL then 1M h2so4 contains how much mL?

1. electric decomposition is better than thermal decomposition. why?
2. what happens when aqueous solution of sodium sulphate reacts with aqueous barium chloride?
3.when a black metal compound XO is heated with colourless gas Y. X is a reddish brown colour which does not react with dilute acid a t all.

state an imp use of decompositon reaction

Why can't Ca and OH- combine into ionic compounds? and H2O and O2-?