Add universal indicator to the beakers of water. Add a small amount of each salt to a different beaker and stir to dissolve. Compare the colors to the reference set. Note: the NaCl will not be pH 7, ...

Prepare a buffer solution by accurately calculating and measuring the required amounts of both the acid and the base components. Use a burette set-up to administer precise quantities of acid and base ...

You add the base/carbonate/metal to the warm acid until no more will dissolve ... The pure solution can drip through the filter paper into the beaker below, leaving the insoluble solids behind.

Speaker one Our base in this case is copper oxide ... Once we see unreacted copper oxide in the beaker…we know that all of the acid has been used up. Yeah, there’s exce-.