High School

2 L of an unknown concentration of the weak base ammonia are standardized.

50.0 mL of the basic solution are titrated with 0.200 M HCl. The end point occurs after 38.8 mL of acid are added.

What is the concentration of ammonia in the 2 L flask?

Answer :

The concentration of ammonia in the 2 L flask, as determined by

titration with 0.200 M hydrochloric acid, is found to be 0.00388 M.

How to determine ammonia concentration in 2 L flask?

  • The concentration of ammonia in the 2 L flask is 0.00388 M.
  • The ammonia solution is standardized by titrating 50.0 mL of it with 0.200 M hydrochloric acid.
  • The end point of the titration is reached after adding 38.8 mL of hydrochloric acid.
  • The moles of ammonia in the solution are equal to the moles of hydrochloric acid used, according to the balanced chemical equation.
  • The moles of ammonia in the 50.0 mL solution is calculated to be 0.00776 mol.
  • Dividing the moles of ammonia by the volume of the ammonia solution (2 L) gives a concentration of 0.00388 M for ammonia in the flask.

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