Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
![A buffer solution is made that is 0.352 M in H2S and 0.352 M in NaHS.
If Ka1 for H2S is 1.00 x 10 7, what is the pH of the buffer solution?
pH
Write the net ionic equation for the reaction that occurs when 0.090 mol HNO3 is added to 1.00 L of the buffer solution.
(Use the lowest possible coefficients. Omit states of matter. Use H30* instead of H*)
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![A buffer solution is made that is 0.306 M in HCN and 0.306 M in KCN.
If K, for HCN is 4.00 x 10 10, what is the pH of the buffer solution?
pH
Write the net ionic equation for the reaction that occurs when 0.082 mol KOH is added to 1.00 L of the buffer solution.
(Use the lowest possible coefficients. Omit states of matter.)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F98ea5121-197a-4f86-83a7-816c407ef905%2F590d078b-c97a-453b-85d4-9685771c30af%2Ftr1893_processed.png&w=3840&q=75)
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Given that:
[H2S] = 0.352 M
[NaHS] = 0.352 M
Ka = 1.00×10-7
Here H2S is a weak acid and NaHS is a salt of weak acid.
pH of the buffer solution can be calculated by the Henderson-Hasselbalch equation.
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