1. The solution with a pH level of 11 is basic.
2. The solution with a pH level of 5 is acidic.
3. The pH of pure or distilled water is 7.
4. No you cannot since blue lithmus paper only can create two chemical reactions that would result in the paper staying blue or becoming red. Therefore blue lithmus paper cannot determine the level of acidity or how basic a substance is exactly but can only tell if the substance is a base or acid.
5. The advantage of a universal indicator is that it can show how acidic or basic a substance is exactly.
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