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how would I Propose a method of successive dilutions to prepare a ~20 ppb solution of Mn from the ~100 ppm stock Mn solution provided

how would I Propose a method of successive dilutions to prepare a ~20 ppb solution of Mn from the ~100 ppm stock Mn solution provided obtain the exact concentration of the standard from the instructor Do not use less than 1.0ml aliquots for these dilutions and you will need minimum 10ml of this standard? step by step dilutions

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