New Haven, Conn. — Scientists at Yale and in Singapore have devised what may be the ultimate acid test — a comprehensive model for estimating the origins of Earth’s habitability, based in part on ...

Substances that are alkaline are basic, or the opposite of acidic — they have a high pH, while acids have a low pH. Lower pH levels reflect a higher quantity of positively charged particles.

Some products are specifically designed to be a lower pH, such as alpha hydroxy acids, so they can do their function. In this case, the acidic nature helps loosen up all the intracellular glue that ...

The other defense against acid is fluoride. As the active ingredient in many toothpastes and rinses, topical fluoride lowers the susceptible pH of enamel from 5.5 to 4.5, meaning any acid must be ...

Ocean acidification is the lowering of seawater pH over time, as the ocean absorbs carbon dioxide (CO 2) from the atmosphere. The pH scale is used to measure how acidic or basic a water-based solution ...

Worldwide, many agricultural soils are deficient in the nutrient zinc—despite the fact that farmers use fertilizers enriched with the element. This limits crop yields and reduces food quality.

or use a pH meter to record the pH. You should find that hydrochloric acid has a lower pH than ethanoic acid. This tells us that the hydrochloric acid released more H + ions than the ethanoic acid ...