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2. What is the purpose of using the cobalt glass in the identification of sodium and potassium?
Weegy: An intense yellow flame confirms the presence of sodium ions. [ The presence of potassium ions is indicated by a pale violet flame which appears reddish-violet through cobalt glass. In a mixture that may contain Na and K salts, it could be difficult to see the pale violet flame of potassium through the intense yellow flame of sodium. For identification of potassium, it is necessary to view the flame through an optical filter to eliminate as far as possible the colors due to sodium, calcium, and other interfering ions. ] (More)
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Asked 1/14/2013 6:29:49 AM
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Who was Genghis Khan’s grandson who captured Baghdad in 1258? A. Barbarossa B. Isfahan C. Saladin D. Hulagu
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Updated 325 days ago|5/28/2014 8:54:26 AM
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Hulagu was Genghis Khan’s grandson who captured Baghdad in 1258.
Added 325 days ago|5/28/2014 8:54:26 AM
This answer has been confirmed as correct, not copied, and helpful.
Confirmed by jeifunk [5/28/2014 8:59:53 AM]
Write an equation of a line with the given slope and y-intercept. m = –1, b = –7
Weegy: The equation of the line, in general form, that passes through the point (1, 1) and has a y-intercept of 2 is y=-x+2, or y=2-x (More)
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Updated 1/15/2013 5:41:13 AM
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The equation of the line with slope m = –1 and y-intercept b = –7 is:
y = - x - 7

Added 1/15/2013 5:41:13 AM
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