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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We can directly solve
this problem using the wavelength formula which is:
wavelength = speed of
light / frequency
We know from the given
that 99.30 FM = 99.30 MHz, therefore:
wavelength =
(2.99*10^8 m/s) / (99.30*10^6 Hz) <span>
<span>wavelength = 3.011 meters</span></span>
Answer:
Mass of magnesium oxide formed = 35.1 g
Explanation:
Given data:
Mass of Mg = 20.9 g
Mass of O₂ = 15.2 g
Mass of magnesium oxide formed = ?
Solution:
Chemical equation:
2Mg + O₂ → 2MgO
Number of moles of Mg:
Number of moles = mass/molar mass
Number of moles = 20.9 g/ 24 g/mol
Number of moles = 0.87 mol
Number of moles of O₂:
Number of moles = mass/molar mass
Number of moles = 15.2 g/ 32 g/mol
Number of moles = 0.475 mol
Now we will compare the moles of MgO with magnesium and oxygen.
Mg : MgO
2 : 2
0.87 : 0.87
O₂ : MgO
1 : 2
0.475 : 2/1×0.475 = 0.95
Number of moles of MgO formed by Mg are less thus Mg will limiting reactant.
Mass of MgO:
Mass = number of moles × molar mass
Mass = 0.87 mol × 40.3 g/mol
Mass = 35.1 g
Answer is: yes, <span>atomic emission spectra of cobalt be the same on Earth as on the moon.
</span>Differente gravity or no atmosphere on Moon don't affect emission spectra of elements,
Emission spectrum<span> of a </span>chemical element<span> is the spectrum of frequencies </span><span>emitted due to an </span>atom <span>making a </span>transition from a high energy state to a lower energy state. <span>Each element's emission spectrum is unique.</span>
