What do we call a pure sample that's run next to the tested substance to see if it's a component in the mixture?

Select the correct answer. given: 2libr + ba → babr2 + 2li in this chemical reaction, 325 grams of barium (ba) react completely. how many moles of lithium (li) are produced? a. 1.18 mol b. 2.37 mol c. 4.73 mol d. 16.4 mol e. 32.9 mol

Avariable that is not being directly tested during an experiment should be

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?