2) A student carries out a titration to determine the concentration of some hydrochloric acid. The student titrates the hydrochloric acid against a standard solution of sodium carbonate,
Na2CO3. The equation is shown below.
Na2CO3(aq) + 2HCl (aq) + 2NaCl (aq) + H2O(l) + CO2(g)
The student prepares 0.150 mol dm-3 Na2CO3 in a 250.0 cm3 volumetric flask.
The hydrochloric acid is added to a 50.0 cm3 burette.
The student pipettes the Na2CO3(aq) using a 25.0 cm3 pipette. en sosial
The student's obtained concordant results and determined the mean volume of HCI used to
be 24.25cm3
Calculate the concentration, in mol dm-3, of the hydrochloric acid.
Give your answer to 3 significant figures.
3 marks.

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the inflammation of diverticulitis can eventually result in a bowel obstruction, which may cause constipation, thin stools, diarrhea, abdominal swelling or bloating, and abdominal pain."

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

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