Answer:
a
Explanation:
idkkkkkkkkkkkkkkkkkkkkkkkk
Answer:
1.2 cm³.
Explanation:
The following data were obtained from the question:
Mass of neckl = 40 g
Density of gold = 19.3 g/cm³
Volume of gold =..?
Next, we shall determine the mass of the gold in the necklace.
From the question given above, we were told that 58% of the mass of the necklace is gold. Thus, we can obtain the mass of the gold in the necklace as follow:
Mass of neckl = 40 g
Mass of gold =?
Mass of gold = 58% × 40
Mass of gold = 58/100 × 40
Mass of gold = 23.2 g
Therefore, the mass of the gold in the necklace is 23.2 g
Finally, we shall determine the volume of the gold in the necklace as follow:
Density of gold = 19.3 g/cm³
Mass of gold = 23.2 g
Volume of gold =..?
Density = mass /volume
19.3 = 23.2/Volume
Cross multiply
19.3 × Volume = 23.2
Divide both side by 19.3
Volume = 23.2 / 19.3
Volume of gold = 1.2 cm³
Therefore, the volume of the gold in the necklace is 1.2 cm³
An indicator with a lower pka will have a color change interval that is base on the ph scale.
Since indicators are weak acids or bases, they change form as the pH fluctuates. When the indicator's pKa and pH are numerically equal, the indicator will be composed of 50% acid and 50% basic forms. One unit higher in pH results in 10% acid form and 90% basic form. As a result, there occurs a progressive switch from almost exclusively acid to almost exclusively base form.
As the ratio of acid to base changes, the colour of the indicator also changes because indicators come in both acid and basic forms. For our eyes to see a colour as pure red or pure yellow, for example, a ratio of roughly 10:1 is typically required.
The precise ratio will depend on the compound's absorbance and how sensitive our eyes are to a particular colour. However, we will typically observe a change over a pH range of about 2 from pKa -1 (90% acid) to pKa +1 (90% basic).
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