Turmeric is yellow in acidic and neutral solutions and red in basic solution.
Sample solution - Nature of solution - Color
(i) Amla juice - Acidic - Yellow
(ii) Lime water. - Basic. - Red
(iii) Common salt - Neutral - Yellow
(iv) Baking soda - Basic - Red
Answer:
The Ka for this acid is 1.4 * 10^-4 (option C)
Explanation:
Step 1: Data given
In a 0.20M aqueous solution, lactic acid is 2.6% dissociated.
Step 2: The equation for the dissociation of HAc is:
HAc ⇌ H+ + Ac¯
The Ka expression is:
Ka = ([H+] [Ac¯]) / [HAc]
1) [H+] using the concentration and the percent dissociation:
(0.026) (0.2) = 0.0052 M
2) Calculate [Ac-] and [H+]
[Ac¯] = [H+] = x = 0.0052 M
3) Calculate [HAc]
[HAc] = 0.20M - x ( since x << 0.20, we can assume [HAc] = 0.20 M
4) Calculate Ka
Ka= [( 0.0052) ( 0.0052)] / 0.20
Ka = 0.0001352 = 1.4 * 10^-4
The Ka for this acid is 1.4 * 10^-4
Atomic weight, as it is essentially the same as mass
Answer:
Nuclear Fusion
Explanation:
<u>In nuclear fusion two lighter nuclei combine together in order to form one heavier nucleus.</u>
For example, the energy generated from the Sun is made by nuclear fusion: Two hydrogen (H, atomic number 1) nuclei combine in order to form one helium (He, atomic number 2) nucleus.
<em>Nuclear fission is the opposite reaction</em>, in which one heavier nucleus splits into two lighter nuclei.
<span>There are 2.74603 * 10^25 hydrogen atoms. Ammonium sulfide is represented by (NH4)2S. This means that there are 8 hydrogen atoms total. There are also 8 mol of H in ammonium sulfide. We also need to use avogadro’s number of 6.022 * 10^23.
Hydrogen Atoms = 5.7mol * (8mol / 1mol) * 6.022 * 10^23 per mol
Hydrogen atoms = 2.74603 * 10^25 hydrogen atoms.</span>
