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* Sodium Hydroxide, NaOH. Available in liquid or powder form. Be sure to note its molarity (M), units of mol/L. For more info on mol, see [https://en.wikipedia.org/wiki/Mole_(unit) here].
:*<code>'''Safety caution''': always wear safety glasses and gloves when handling NaOH in any concentration. NaOH can cause severe burns. In concentrations higher than 0.1, NaOH can corrode through clothing. See [https://www.ccohs.ca/oshanswers/chemicals/chem_profiles/sodium_hydroxide.html Canadian Centre for Occupational Health and Safety on Sodium Hydroxide].</code> :*Note that bottles of NaOH should be capped so as to avoid as much exposure to the air as possible. This is because NaOH reacts with CO<sub>2</sub> in the air, causing the NaOH to become inaccurate as a base titration overtime <ref>[https://www.sciencedirect.com/science/article/pii/S2405656116300578 A novel rate of the reaction between NaOH with CO<sub>2</sub> at low temperature in spray dryer. Yadollah Tavan, Seyyed Hossein Hosseini. 2017. DOI: https://doi.org/10.1016/j.petlm.2016.11.006.]</ref><ref>[https://www.chem.indiana.edu/wp-content/uploads/2017/11/17-3-Sodium-Hydroxide-and-Carbon-Dioxide.doc "Sodium Hydroxide and Carbon Dioxide: Why it is Important to Keep Your Standard NaOH Solutions Capped". Indiana University course material. Retrieved 10/18/2018.]</ref><ref>[https://www.homebrewersassociation.org/how-to-brew/resources/conference-seminars Robert Hall. The "Sour" in Sour Beers: Microbiology Sensory Perception and Styles. HomebrewCon 2018 Seminar. 2018.]</ref> (~42:00 mins in).
* Nitrile or latex gloves. NaOH is a strong base, it will hurt you if you get any on your skin.