Levels of Organization 1. Molecular Level 2. Cellular Level 3. Tissue Level 4. Organ Level 5. Organ System Level 6. Population Level 7. Community Level 8. Ecosystem Level 9. Biosphere Level
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- Match each weak acid with the pH value at which it would buffer. pH 3 ammonium (PK, of 9.25) chloroacetic acid (pK, of 2.87) acetic acid (pK₂ of 4.76) formic acid (PK, of 3.8) pH 5 Answer Bank boric acid (PK, of 9.24) pH 9 hydrazoic acid (PK, of 4.6)pH expresses the molar concentration of hydronium ions in an aqueous solution on a logarithmic scale. (Note that it is common to use the hydrogen ion, H*, to represent the hydronium ion, H3O+.) pH = -log[H3O+] [H3O+] = 10-PH As pH decreases, acidity increases. As pH increases, acidity decreases. • Acidic solution: pH 7 Part A - Calculating pH Submit [H₂0+] 1 Acidic pH 01 10¹ 102 103 104 105 106 107 108 109 10-10 10-11 10-12 10-13 10-14 stomach acid 3 wine lemon tomatoes juice vinegar, black soft drinks, coffee beer 6 Neutral urine milk 7 human blood pure water sea- water baking soda 10 11 12 13 14 milk of magnesia house- hold ammonia oven cleaner Basic household bleach Adapted from Biological Science by Freeman ©2008 Pearson Education, Inc. What is the pH of an aqueous solution with the hydronium ion concentration [H3O+] = 2 x 10-14 M? Make sure that your answer has the correct number of significant figures. For help determining the correct number of significant figures, see Hint 3. ►…Describe the general functions of the four main groups of organic chemicals in cells.