A concentrated acid is an acid which is in either pure form or has a high concentration. Laboratory type sulfuric acid (about 98% by weight) is a concentrated (and strong) acid.
A dilute acid is that in which the concentration of the water mixed in the acid is higher than the concentration of the acid itself. For instance, 5% sulfuric acid is a dilute acid.
A dilute acid, unlike a concentrated acid, will ionize to a greater degree in their solution (higher percent dissociation with decreasing concentration). However, if an aqueous acid mixture (such as sulfuric acid, mentioned above) is added to water, the resultant pH from adding a dilute one would be higher (lower acidity) than for a concentrated one.
A dilute solution of a strong acid contains more H3O^+ ions than a concentrated solution of a weak acid.
A strong acid is an acid that dissociates completely in solution while a weak acid is an acid that does not dissociate completely in solution. This means that, we will have more ions in a dilute solution of a weak acid than we will have in a concentrated solution of a strong acid since strong acids achieve 100% dissociation in solution.
Since acids all have H3O^+ ions in solution, it follows that dilute strong acid solutions contain more H3O^+ ions concentration than concentrated weak acid solutions.
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