Therefore, when both species are present in appreciable concentrations, two peaks occur in the spectrum for each of the individual species. The pump is great, but the bottles that came with the pump appear to be labeled incorrectly. If slow exchange occurs, an individual 2-naphthol or 2-naphtholate species stays in its protonated or deprotonated form during the entire excitation-emission process and emits its characteristic spectrum. Draw the spectra at the same pH when the exchange rate is fast.
Spectra bottles reading wrong amount series#
Draw the series of spectra that would result for an initial concentration of 2-naphthol of 10 -6 M if the pH was adjusted to 2, 8.5, 9.5, 10.5, and 13 and slow exchange occurred. if there is evidence of milk in the tubes, dont buy the pump. Youd want new diaphragms and duckbills anyways. This reaction may be either slow (slow exchange) or fast (fast exchange) on the time scale of fluorescence spectroscopy. flanges, plastic part of the backflow protectors, bottles including the nipples. Spectra bottles are not accurate compared to other bottles. The only differences between Spectra S1 and S2 is that the S1 (the blue version) comes with a rechargeable battery, giving it the ability to be cordless and perfectly portable. Spectra bottles require an adapter to be used with Medela pump parts, or with the Kiinde system.
Resonance forms involving the oxygen atom of 2-naphthol and 2-naphtholate.Ĭonsider the reaction shown below for the dissociation of 2-naphthol. The nice thing about the two most common Spectra Breast Pump models S1 and S2, is that the buttons and settings are the same.
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