The most concentrated solution is b
Base pairs of DNA are A with T, and C with G
here's how to remember:
Apple - Tree
Car - Garage
Sodium Chloride is a compound.
Answer:
The answers are explained below
Explanation:
a)
Given: concentration of salt/base = 0.031
concentration of acid = 0.050
we have
PH = PK a + log[salt]/[acid] = 1.8 + log(0.031/0.050) = 1.59
b)
we have HSO₃⁻ + OH⁻ ------> SO₃²⁻ + H₂O
Moles i............0.05...................0.01.................0.031.....................0
Moles r...........-0.01.................-0.01................0.01........................0.01
moles f...........0.04....................0....................0.041.....................0.01
c)
we will use the first equation but substituting concentration of base as 0.031 + 10ml = 0.031 + 0.010 = 0.041
Hence, we have
PH = PK a + log[salt]/[acid] = 1.8 + log(0.041/0.050) = 1.71
d)
pOH = -log (0.01/0.510) = 1.71
pH = 14 - 1.71 = 12.29
e)
Because the buffer solution (NaHSO3-Na2SO3) can regulate pH changes. when a buffer is added to water, the first change that occurs is that the water pH becomes constant. Thus, acids or bases (alkali = bases) Additional may not have any effect on the water, as this always will stabilize immediately.
Answer: The mole fraction of methanol
Xmeth= 0.59
The mole fraction of ethanol
Xeth = 0.41
Explanation:
Mole fraction of a component can be determined by:
Xi = moles of i / total moles of the components the components
Where i indicates the component
An equal mass of 100.0g is assumed for both methanol and ethanol
Molar mass of Methanol (CH4O)
= (1*12) + (4*1) +(1*16) =32g/mol
Mole of Methanol = mass of methanol /molar mass of methanol
=100/32 = 3.13mol.
Molar mass of ethanol ( C2H6O)
= (2*12)+(6*1)+(1*16) = 46.0g/mol
Mole of ethanol = 100/46
= 2.17mol.
Mole fraction of methanol (Xmeth)
= moles of methanol / total moles
Xmeth = 3.13/(3.13+2.17)
Xmeth = 0.59
Mole fraction of ethanol (Xeth)
= moles of ethanol /total moles
= 2.17/((3.13+2.17)
Xeth= 0.41
