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Ionic and Molecular Compounds Lab

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Introduction

Title: Ionic and Molecular Compounds Lab Problem: What are some characteristic properties of: * Ionic compounds? * Molecular compounds? * Acids? * Bases? Which of the unknown compounds provided are: * Ionic compounds * Molecular compounds * Acids * Bases Materials: eye dropper eight different known chemical compounds eight unknown chemical compounds spot plate blue and red litmus paper pH test paper strips conductivity tester lab apron safety goggles Procedure: 1. These tests are available to you. a. Conductivity test b. Litmus test c. pH paper 2. Also record qualitative data 3. Classify compound into one of these categories: a. a. ionic b. molecular c. acid d. base Observations: Substance Formula with state Litmus (B-R or R-B...) ...read more.

Middle

Substance Formula Type of compound boric acid H3BO3(aq) acid Phosphoric acid H3PO4(aq) acid sodium hydroxide NaOH base Ammonium hydroxide NH4OH base Copper (II)sulphate+ pentahydrate CuSo4.5H2O+H2O ionic Sodium chloride+ water NaCl+H2O ionic Glucose+ water C6H12O6+H2O molecular Silicon dioxide (silica)+ water SiO2+H2O molecular Unknown2 / molecular or acid Unknown3 / Ionic Unknown4 / base Unknown6 / ionic Unknown7 / base Unknown8 / acid Unknown9 / acid Unknown10 / molecular 2. Type of compound Characteristics Ionic compounds conduct electricity, contains positively and negatively charged elements, high melting point, high boiling point Molecular compounds do not conduct electricity, contains only negatively charged elements (anions), low melting point, low boiling point Acids has a pH level less than 7, have H at the start or end of formulas, tastes sour, not slippery Bases usually contains hydroxide, has a pH level greater than 7, ...read more.

Conclusion

Unknown 8 had a pH level of 4, and unknown 9 had a pH level of 1. Unknowns 4 and 7 could be bases because they both had a pH level of 14, making them very basic. An error that was made in this experiment is that each of the substances could be contaminated when the litmus paper was put into them for too long, and the chemicals on the litmus paper may dissolve in the substances. Also, a substance could be contaminated when the conductivity tester was previously dipped into another substance, and is not cleaned thoroughly before being put into the next substance. One of the improvements that can be made is that try not to leave the litmus paper in the substance for too long. Also, a different conductivity tester could be used for each of the substances to minimize the amount of contamination. ...read more.

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