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Aleksandr-060686 [28]
3 years ago
10

Why is color a useful property for identifying malachite, but not quartz?

Biology
2 answers:
natulia [17]3 years ago
6 0

Answer:

Quartz can come in many different colors and shapes idk about malachite but i know that about quartz!

Explanation:

Hatshy [7]3 years ago
6 0

Answer:

Streak is a more reliable property than color because streak does not vary. Minerals that are the same color may have a different colored streak. Many minerals, such as the quartz in the Figure above, do not have streak. ... The streak of hematite across an unglazed porcelain plate is red-brown. Malachite (MAL-uh-KYT), an ore of copper, is green. Color, however, is the least useful property for mineral identification. One reason is that many minerals have similar colors. ... Another reason not to rely on color alone is that some minerals can change color in various circumstances.

hope this helps!!!!!!!!!! Can I have brainilist pls thx :)

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A certain buffer is made by mixing a weak acid HA and its conjugate base A–. When HA is present at a concentration of 0.5 mM and
MAVERICK [17]

Answer:The ratio of the concentrations of HA  and A^- when the buffer has a pH of 7.02 is 0.69

Explanation:

The dissociation constant for formic acid = K_a=1.8\times 10^{-4}

Concentration of HA= 0.5 mM

Concentration of A^-= 0.1 mM

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First we have to calculate the value of K_a.

Using Henderson Hesselbach equation :

pH=pK_a+\log \frac{[A^-}{[HA]}

Now put all the given values in this expression, we get:

6.16=pK_a+\log (\frac{[0.1]}{0.5})

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To calculate the ratio of the concentrations of HA  and A^- when the buffer has a pH of 7.02.

Using Henderson Hesselbach equation :

7.02=6.86+\log \frac{[A^-]}{[HA]}

7.02=6.86+\log \frac{[A^-]}{[HA]}

\frac{[A^-]}{[HA]}=1.44

\frac{[HA]}{[A^-]}=0.69

Thus the ratio of the concentrations of HA  and A^- when the buffer has a pH of 7.02 is 0.69

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Black_prince [1.1K]

Hey mate !

here is ur answer(refer the image)

thank u ..

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follow me

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