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what is the ph of phosphate buffer used in dissolution?

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2.84 moles of gas are at a pressure of 699.5 mmHg and a temperature of 303 K.  What is the volume of the gas?

As you have told in the answers to my earlier question, if I neutralise aqua regia with a 1:3 mixture of NaOH and KOH, then as it is itself a 1:3 mixture of HNO₃ and HCl, does it form a double salt (NaNO_3.3KCl) with 4 H₂O molecules or two individual salts (NaNO₃ & 3KCl) with 4 H₂O molecules?