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If 5.0 mL of 0.12 mmol dm-3 MB solution is diluted by adding 20.0 mL of 0.2 mol dm-3 HCl to it, what is the new MB concentration?

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What is MB?

methylene blue

If this is just a dilution problem, then
0.12 mM/dm-3 x (5.0 mL/25.0 mL) = ?

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