ADDITIONAL QUESTION Tris(hydroxymethyl)aminomethane, also known as Tris (and als

Question

ADDITIONAL QUESTION Tris(hydroxymethyl)aminomethane, also known as Tris (and alsoa s Tris base, Trizma and THAM), an organic compound with the formula (HOCH2)sCNH2. It is a water-solube amine base Because Tris is a crystalline solid that can be obtained in a state of high purity, it can be used as a primary standard base for determining the concentrations of acid solutions. The reaction of Tris with HCI is- (HOCHz)3CNH2(aq) + HCl(aq) (HOCHz)3CNH3+?(aq) -> The concentration of a hydrochloric acid solution is determined by titration using Tris. It is found that exactly 14.00 mL of the HCI solution are required to neutralize a solution that was prepared by dissolving exactly 424.0 mg of Tris in about 50 mL of distilled water. What is the molarity of the HCl solution? (Tris has molar mass 121.14g/mol)

Explanation / Answer

From the given balanced chemical reaction equation it is clear that 1 mol tris requires 1mol HCl, so molar ratio is 1:1

1 mg = 0.001 g; 1 mL = 0.001 L

moles present in 424 mg of tris = [424 x 10-3 g] / 121.14 g/mol = 0.0035 mol

exactly this much moles required at neutralization point

HCl volume = 14 mL = 0.014 L

Molarity = moles / liter = 0.0035 mol / 0.014 L = 0.25 M

Final answer: HCl molarity = 0.25 M

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