5) Scientists use the pH scale to represent the level of acidity or alkalinity of a liquid. This is based on the molar concentration of hydronium ions, [H+]. Since the values of [H+] vary over a large range, 1 × 100 mole per liter to 1 x 10-14 mole per liter (mol/L), a logarithmic scale is used to compute the pH. The formula pH = -log[H+] %3D represents the pH of a liquid as a function of its concentration of hydronium ions, H+]. The pH scale ranges from 0 to 14. Pure water is taken as neutral having a pH c 7. A pH less than 7 is acidic. A pH greater than 7 is alkaline (or basic). Two acids have [H+] valu es of 3.2 x 10-3 mol/L and 2.4 x 10-6 mol/L respectively. Find the pH for each acid. Which substance is more acidic? Round pH values to 1 decimal nlace
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.
![5) Scientists use the pH scale to represent the level of acidity or alkalinity of a liquid.
This is based on the molar concentration of hydronium ions, [H+]. Since the valu es
of [H+] vary over a large range, 1 × 100 mole per liter to 1 x 10-14 mole per liter
(mol/L), a logarith mic scale is used to compute the pH. The formula pH = -log[H+]
represents the pH of a liquid as a function of its concentration of hydronium ions, [
H+]. The pH scale ranges from 0 to 14. Pure water is taken as neutral having a pH of
7. A pH less than 7 is acidic. A pH greater than 7 is alkaline (or basic).
Two acids have [H+] valu es of 3.2 x 10-3 mol/L and 2.4 x 10-6 mol/L respectively.
Find the pH for each acid. Which substance is more acidic? Round pH values to 1
decimal place.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fb4dca08d-d7c1-4511-81d7-e3b17171b463%2F295c8e48-5ea0-4eb8-a6ec-c70cae4f16b0%2F13u0kbk_processed.png&w=3840&q=75)
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