Question

lesson 1

1. what have you heard about ph? can you think of an example of how ph can be used?

1. beverages tend to have more acidic ph values. do a quick internet search of two common beverages and compare their ph values.

Explanation:

1. For the first question, pH is a measure of the acidity or alkalinity of a solution, ranging from 0 (very acidic) to 14 (very alkaline, with 7 being neutral). An example of pH use is in agriculture, where soil pH is tested to determine which crops can be grown (e.g., blueberries need acidic soil, pH around 4.5 - 5.5). In water treatment, pH is adjusted to make water safe for consumption or industrial use. In the human body, blood pH is tightly regulated (around 7.35 - 7.45), and deviations can cause health issues.
2. For the second question, let's take two common beverages: lemon juice and milk. Lemon juice is highly acidic, with a pH typically between 2 and 3 (due to citric acid). Milk is slightly acidic or neutral, with a pH around 6.5 - 6.7 (it contains lactic acid and other components, but is much less acidic than lemon juice). Another example: cola (e.g., Coca - Cola) has a pH around 2.5, while orange juice has a pH around 3.5 - 4.0. Cola is more acidic than orange juice because of the phosphoric acid and other acidic components in cola, while orange juice's acidity comes mainly from citric acid.

Answer:

1. pH measures solution acidity/alkalinity (0 - 14, 7 neutral). Example: Soil pH for agriculture (blueberries need pH 4.5 - 5.5).
2. Example beverages: Lemon juice (pH 2 - 3, acidic) and milk (pH 6.5 - 6.7, less acidic). Or Cola (pH ~2.5) and Orange juice (pH 3.5 - 4.0), Cola is more acidic.