A word about molarity In this experiment, you will of moles per liter (mol/L). M

Question

A word about molarity In this experiment, you will of moles per liter (mol/L). Molarity is a measure of the concentration of a suion. encounter the symbol M. lt stands for molarity and has units Procedure Getting started 1. Obtain n several pieces of red and blue litmus paper and 4 small test tubes Use a 5-ml or a 10-ml. graduated cylinder to place 1 ml of distilled waterin each of these test tubes. Mark the height of the water with a marking pencil or a small piece of tape. Add an additional 1 ml. to each of these test tubes and mark the new height of the water. Pour the water out of each test tube. 3. Obtain instructions for using the centrifuges in the laboratory CAUTION: When you use a centrifuge, do not attempt to stop the centrifuge rotor with your finger or anything else. 4. Obtain directions for discarding the solutions that you use during this experiment. 5. Remember to be careful in your handling of the solutions in this experiment. CAUTION: Sodium hydroxide, hydrochloric acid, acetic acid, and ammonia can cause chemical burns in addition to ruining your clothes. If you spill any of these solutions on you, wash the contaminated area thoroughly with water, and report the incident to your instructor. You may require further treatment. Testing the solubility rules 1. Using the lower marks on the 4 test tubes as guides, add 1 ml of 0.1 MNHNO, to each. Using the upper marks as guides, add 1 mL. of 0.1 M NaBr to the first tube, I mL of 0.1 M Na SO, to the second, I mL of 2 MNaOH to the third, and 1 mL. of 0.1 M NaCO, to the fourth. Shake each test tube gently. Record your observations, noting the colors of all precipitates. 2. 3. Wash the test tubes carefully, and rinse them with distilled water. 4. Repeat Steps 1 through 3 with, in turn,0.1 M Ba(NO,),0.1 MAgNO,0.1 MPb(NO and 0.1 M Ni(NO,)2 instead of NH NO, (see Step 5). CAUTION: Wash your hands thoroughly after using the solution containing barium because it is poisonous 5. Centrifuge the contents of the test tube that originally contained 0.1 M Ni(NO,)h and 2 M NaOH. About I min will be required. Decant (pour off) and discard the solution. Save the precipitate for subsequent use.

Explanation / Answer

Name of Acid Formula of Acid Name of Base Formula of Base Hydrochloric Acid HCl AMMONIA NH3 Aceteic Acid CH3COOH SODIUM HYDROXIDE NaOH AMMONIUM CARBONATE NH4CO3

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