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Which of the following mixtures will be a buffer when dissolved in a liter of water? a) 0.2 mol HF and 0.1 mol NaOH b) 0.2 mol HBr and 0.1 mol NaOH c) 0.3 mol NaCl and 0.3 mol HCl d) 0.1 mol Ca(OH)2 and 0.3 mol HI