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The hydronium ion concentration in an aqueous solution at 25 C is 6.1 × 10-2 M. What is the hydroxide ion concentration in this solution? An extra amount of magnesium is included in the mass you are to use. explain the purpose of adding extra magnesium.? The area of a circle is given by (pi k squared minus twelve pi k plus 36 pie) square inches. What is the radius of the circle? The rate of change of y with respect to t is proportional to 50 - y? The point (4,4) lies on a circle whose center is at (0,1). How do I write the standard form of the equation of this circle?