A student dissolves a sample of barium hydroxide to make a 125-mL solution and then titrates it with 50 mL of a 2.5 M hydrochloric acid solution to reach the endpoint. 1. Write the balanced chemical equation for this reaction. 2. What was the molarity of the 125 mL barium hydroxide solution before titration? 3. How many grams of barium hydroxide did the student dissolve in the 125-mL solution?
States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
A student dissolves a sample of barium hydroxide to make a 125-mL solution and then titrates it with 50 mL of a 2.5 M hydrochloric acid solution to reach the endpoint.
1. Write the balanced chemical equation for this reaction.
2. What was the molarity of the 125 mL barium hydroxide solution before titration?
3. How many grams of barium hydroxide did the student dissolve in the 125-mL solution?
4. The student wishes to use the reaction of barium hydroxide and hydrochloric acid to produce 432 kJ of heat. The DH for this reaction is –54 kJ/mol of HCl, how many grams of barium hydroxide are required?
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The student wishes to use the reaction of barium hydroxide and hydrochloric acid to produce 432 kJ of heat. The DH for this reaction is –54 kJ/mol of HCl, how many grams of barium hydroxide are required?
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