ANAL 618: Standardizing a Solution Patrick Krause ANAL 618: Standardizing a Sodium Hydroxide Solution Patrick Krause CHEM 1108 - Thurs. 1:00pm Dr. Dang-Bachlien Introduction The purpose of the experiment is to standardize a sodium hydroxide solution by using it to titrate a solution of potassium hydrogen phthalate Background Solutions are among the most useful “tools” available to chemists. Knowing a concentra- tion of the solution, allows chemists to determine precisely how much solute is present in any specified volume of a solution. The solution can be used as a measuring device to determine the concentrations of other solutions or substances. Solutions are standardized when its concentration can be determined; a standard solution is one whose concentrations we know. The concentration of a solution is expressed as the num- ber of moles of solute present in one liter of solution, known as molarity (M). Equations KHP (aq) + NaOH (aq) ⾮ NaKP (aq) + H 2 O (l) (Eq. 1) Chemicals & Safety • sodium hydroxide (NaOH) — corrosive and toxic, and can cause skin burns • hydrochloric acid (HCl) — toxic, corrosive solution that can cause skin burns
ANAL 618: Standardizing a Solution Patrick Krause Equipment Procedure I. Delivering Water from a Buret First, labeled a 400-mL beaker “Discarded Solutions”. Closed the stopcock of your buret. Filled the buret with tap water. Opened the stopcock and drained the water through the tip into the beaker.
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- Fall '17
- Sodium hydroxide, Buret