Make a 200l of a sodium phosphate buffer ph 505 and another, Ask an Expert

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Make a 2.00L of a sodium phosphate buffer pH 5.05 and another 2.00L sodium phosphate buffer of 7.12 pH using the Henderson-Hasselbach equation, determine how much and which salts you will use if you add the correct amount of salts, sometimes the pH can still vary. Why is that? Other than temperature change?

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