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    Density of sodium hydroxide

    Hi all.. I have a question regarding the density of a solution. In my lab manual, it said to use 50 mL of 20% NaOH solution I have problem of understanding whether the 20% is the molar or mass or volume basis.. It doesn't state anything else in there.. what does it usually means? And i think...
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    Spectral bandpass

    Hi.. can anyone please explain to me what does it mean by spectral bandpass of monochromator? i tried to look for it in my textbook, but i can't really find anything.. what i think is that this spectral bandpass gives you the size (wavelength range) of the wave component (after it passed the...
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