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Ferrofluids are not true solutions, but are stable colloidal suspensions. Brownian motion is sufficient to keep the tiny particles, on the order of 10 nm, from settling out. Other examples of colloids are milk (fatty globules in liquid) and colloidal gold in water. Though an alternating magnetic field in an AC-powered solenoid would only stir up the ...


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A numerous studies have shown that the absorbtion of $\ce{NO2}$ in alkaline solutions is due to the reaction (For example, Ref.1): $$\ce{2NO2 + 2OH- -> NO2- + NO3- + H2O} \tag1$$ Thus, as Poutnik pointed out, you may use dilute solution of $\ce{NaOH}$ solution, if you preferred. For insterd, Ref.2 has used sodalime, mainly $\ce{Ca(OH)2}$, in its solid ...


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