You are given a 400 mL buffer solution comprised of 0.035 M HF and 0.0125 M NaF. Do you need to add acid or base to the original solution to reach a desired pH of 3.50

Why did southern business leaders want to increase the number of slaves

Which element is the least metallic between cadmium, silver, zinc, or iron?

As air becomes more dense, (select all that apply) o. air weighs less o. gas molecules are closer together o. air is colder o. air weighs more o. gas molecules are further apart o. air is hotter