Calculate pH of a solution, Chemistry

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A 0.5M solution of NaNO2 is made. What is the pH of the solution?

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The standard EMF of Pt/H2(g)/HCl(aq)//AgCl(aq)/Ag has been experimentally determined from 0-90?C to yield the following; E?/V =0.23659 – 4.856 * 10-4t(?C) – 3.4205 * 10-4t2(?C) +

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