Explanation:
molar mass of the compound = 24 + 2× 14+ 16×6
= 24 + 28 + 96
= 148g/mol
no of moles = given mass / molar mass of the compound
1.4 = given mass/ 148
1.4×148=given mass
207.2 g
Answer:
AgBr
Explanation:
The salt, AgBr has a very low solubility is pure water. However, it has a high solubility in 1 M NH3. The reason behind this higher solubility of AgBr in 1 M aqueous ammonia solution is the formation of a complex as shown below;
AgBr(s) + 2NH3(aq) ----> [Ag(NH3)2]^+(aq) + Br^-(aq)
The formation of this linear silver diammine complex accounts for the higher solubility of AgBr in 1 M aqueous ammonia solution.
Natural selection and selective breeding can cause both animal and plant changes. The distinction between the two is that natural selection occurs without human intervention, while selective breeding occurs only when humans interfere. As a result, selective breeding is also known as artificial selection.
The equation for the acid base reaction can be written as
CH3COOH + NaOH → CH3COONa + H2O
We calculate the number of moles of the acid which is equal to the base at equivalence point:
mol CH3COOH = 0.1000 M * 0.025L = 0.00250 mol
= mol H+ reacted = mol OH- used = mol CH3COO-
where the number of moles of salt CH3COONa formed is equal to the number of moles of acid and base.
Using the total volume of the solution, we now compute for the molarity of the salt solution:
[CH3COO-] = 0.00250 mol/(0.025L + 0.025L) = 0.0500 M
The equation for the hydrolysis reaction by the salt is given by
CH3COO- + H2O ⇔ CH3COOH + OH-
initial 0.0500 0 0
equilibrium 0.0500-x x x
Using Kw, we write an expression for Kb for the salt:
Kb (for CH3COO-) = Kw/Ka(for CH3COOH) = 1.0x10-14 / 1.8x10-5
Now solving for the concentration x of OH- formed:
Kb = x²/(0.0500-x)
approximating that x is negligible compared to 0.0500 simplifies the expression to
1.0*10^-14/1.8*10^-5 = x²/0.0500
x = 5.27*10^-6 = [OH−]
Finally, we calculate pH from pOH:
pOH = −log(5.27*10^-6) = 5.28
pH = 14−5.28 = 8.72
A neutrally charged chlorine atom becomes a negatively charged chlorine ion.
