experiment 4 prelab

experiment 4 prelab - Amanda Neal Experiment 4 Pre lab...

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Amanda Neal Experiment 4 Pre lab questions 1.) a. Titration: a technique where a solution of a known concentration is used to determine the concentration of an unknown solution b. Equivalence point: When the analyte solution is neutralized c. Standard solution: solution containing a precisely know concentration of an element or substance d. Monoprotic acid: an acid that donates only one proton or hydrogen atom per molecule to an anagueous solution e. Diprotic acid: an acid that contains within its molecular structure two hydrogen atoms per molecule capable of dissociating in water. f. Endpoint: refers to the point at which the indicator changes color in a colorimetric titration. 2.) The most common indicator is found on “litmus” paper. A variety of indicators change color at various pH levels. A properly selected acid-base indicator can be used to visually "indicate" the approximate pH of a sample. An indicator is usually some weak organic acid or base dye that changes colors at definite pH values. The weak acid form (HIn) will have one color and the weak acid negative ion (In - ) will have a different color. "Acid and Base Indicators."  - Chemwiki . 2013. Web. 18 Feb. 2016.  3.) Hydrochloric acid: melting point is -26 °C Boiling point: 110 °C Colorless watery liquid with sharp, irritating odor Sodium Hydroxide: Colorless, odorless liquid.
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