Question

 A sample of tris(hyroxymethyl)aminomethane (H₂NC(CH₂OH)₃), which is a base, with a mass of 0.5492 g is dissolved in water and used to standardize a solution of hydrobromic acid. An endpoint is reached when 46.21 mL of hydrobromic acid has been added. Determine the molarity (in mol/L) of the hydrobromic acid solution. Report your answer to four significant figures. 

Answer 1

Moles $=\frac{0.5492}{121}=0.0045moles$

Molarity = moles/ volume

Molarity $=\frac{0 .0045}{46.21}=0.000097M$