(Answered) Start with a 150 ml sample of 45 m hydrofluoric acid what

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Start with a 150 ml sample of .45 M hydrofluoric acid. What is the ph? If you buffer the solution by adding sodium fluoride to a ph of 4, how many grams of NaF would you need to add? How many grams of NaOH would you have to add to raise the PH of the solution to 4.22?

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