SOS: Finding pH in Buffer Solutions

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Calculate the initial pH of 0.315 L of a 0.535 M NaHSO3 - 0.280 M Na2SO3 buffer.
 
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start off by finding the number of moles and then -log(ans)
 

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I don't get how to argue it. i can prove: evolution is the ability to adapt, whether it's progression or regression from some point of view, so if evolution is not constant then animal generations couldn`t stay alive for a big amount of time because when climate is changing this generations die. but they dont. so evolution is constant. but its not an argument, right? how to fing arguments when i only prove it.. analytically, i guess it called that (this is indirectly related to biology, im...
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