1. A pH scale reading of more than 7 indicates _______ medium.   an unknown   an acidic   a basic   a neutral   Hint Half-n-half Clue   2. A pH scale reading of 2 indicates a _______.   strong base   strong acid   weak base   weak acid   Half-n-half Clue   3. Sodium hydroxide turns red litmus paper blue.   True   False   4. A pH scale reading of 13 indicates a _______.   weak base   weak acid   strong base   strong acid   Half-n-half Clue   5. A pH scale reading of _______ indicates a weak acid.   2   6   13   8   Half-n-half Clue   6. A pH scale reading of _______ indicates a weak base.   13   8   2   6   Half-n-half Clue   7. Addition of phenolphthalein solution to an acid results in no color change.   True   False