- What major changes occured from Thomsons's model to Rutherford's model?

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Find the pH of a solution at 25°C in which [OH–] = 2.5 x 10–9 M.? I am given F ratios and i have to find f?
Example: numerator of df=7, denominator of df=25. How to do this in R programming? Find the area of a circle of radius: a. 14cm b. 10.5 cm c. Use pi= 22/7.? What is the square root of Quan? At 70°C, the pH of water is 6.41. What is the ion-product constant of water, Kw, at 70°C?

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