pH of a mixture of .001M sodium bicarbonate dissolved in water

How do you go about calculating the pH of .001M sodium bicarbonate (NaCO3) dissolved in water.....I some how derived the right answer which is pH = 8.3 but really have no idea how /i actually got the answer. How would I go about deriving the amount of [H+] so that I could use the equation [H+] = -log(???) = pH = 8.3

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