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________________ is a scale used to determine the approximate pH of a solution.
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Construct an angle of 45° at the initial point of a given ray and justify the construction. ... Taking O as centre and some radius, draw an arc of a circle, which intersects OA, say at a point B. 2. Taking B as centre and with the same radius as before, draw an arc intersecting the previously drawn arc, say at a point C.
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