Question

Complete each phrase to state the meaning of the expression h+7.

Answer 1

The expression 'h+7' in the context of pH means that we are 7 units above a specific hydrogen ion concentration on the pH scale. pH values less than 7 indicate acidity, a pH of 7 is neutral, and values above 7 depict basicity. The pH can be calculated using the formula pH = -log[H3O+], where [H3O+] is the hydrogen ion concentration.

Step-by-step explanation:

To state the meaning of the expression h+7, we need to understand the context in which it is presented. If we are referring to the pH scale, then the expression would mean that the pH value is 7 units above some hydrogen ion concentration. It is important to note that pH is a measure of the acidity or basicity of a solution. If pH is less than 7, the solution is acidic; if pH is exactly 7, it's neutral; and if pH is greater than 7, it is basic.

Using the formula pH = -log[H3O+], where [H3O+] is the hydrogen ion concentration, we can understand how pH levels represent the acidity or basicity of solutions. For instance, if a solution has a hydrogen ion concentration of 1.0 x 10-7M, its pH would be 7, indicating a neutral solution. This occurs when the concentrations of H+ ions and OH- ions are equal, leading to a neutralization reaction where H+ (aq) + OH- (aq) → H2O (l). As such a solution has neither acidic nor basic properties.

Answer 2

7 added to a number

A number increased by 7

7 more than a number

7 added to a number: This is the most literal interpretation of the expression. It means that you take any number (represented by h) and add 7 to it.

A number increased by 7: This emphasizes the effect of adding 7. It means that the starting value of the number (h) is increased by 7.

7 more than a number: This highlights the difference between the number and 7. It means that the resulting value (h+7) is 7 greater than the starting number (h).

All three options convey the same meaning, just with slightly different nuances. The choice of which one to use depends on the context and what you want to emphasize.