Acid concentration refers to the amount of acid present in a solution, usually measured in moles per liter (Molarity).
Think of acid concentration like a bowl of spicy salsa. The more chili peppers (acid) you add, the spicier (more concentrated) the salsa becomes.
Molarity: This is a measure of the concentration of a solute in a solution, or of any chemical species in terms of amount of substance in a given volume.
pH Scale: A logarithmic scale used to specify the acidity or basicity/alkalinity of an aqueous solution.
Hydronium Ion Concentration: The number of hydronium ions (H3O+) per unit volume; it's directly related to pH and acid strength.
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