?

If I have 20 mL of 0.1 M HCl and I titrate it with 0.1 M NaOH, the equivalence point should be about at pH = 7, and 20 mL of titrant.

The pH of 0.1 M HCl is about -log(0.1) = 1, so the pH at the half-equivalence point has to be between 1 and 7. If this was a weak acid being titrated with a strong base then this point would yield the pKa.

However, for HCl the half-equivalence point doesn't yield the pKa. Lots of literature suggests that the pKa of HCl is less than 0.

Is this determined by titration somehow?

Where are you on the faith spectrum?

Do you feel like there are certain advantages to belonging to a certain sect in terms of how people treat you?

How many cups daily?

Like you press the A key and you get "M" and the M-key and you get "S" and so forth.

Consider the burning of hydrogen gas using oxygen to produce water:

Balanced: 2H2 + O2 ----> 2H2O

If it was somehow possible to put an equal number of H2 and O2 molecules in the system. So 2 of each,

I would get 2 molecules of H2O produced with 1 molecule of unreacted oxygen. Since oxygen is in excess then H2 must be the limiting reactant.

But if I start with 1 gram of each, from 1 gram H2 I get 9 grams H2O; whereas from 1 gram O2 I get 1.125 g H2O. Therefore, I get less product from O2 so oxygen should be the limiting reactant.

Calculations:

1 g H2 * (1 mole H2 / 2 g H2) * (2 moles H2O / 2 moles H2) * (18 grams H2O / 1 mole H2O) = 9 grams H2O

1 g O2 * (1 mole O2 / 32 g O2) * (2 moles H2O / 1 mole O2) * (18 g H2O / 1 mole H2O ) = 1.125 g H2O

2 molecules H2 * (2 molecules H2O / 2 molecule H2) = 2 molecules of H2O

2 molecule O2 * (2 molecules H2O / 1 molecule O2) = 4 molecules H2O.

Summary:

When I use an equal number of molecules of each reactant,

I get less molecules of H2O from H2 so I conclude H2 is the limiting reactant.

When I use an equal number of grams of each reactant, I get less mass (g) of H2O from O2 so I conclude O2 is the limiting reactant.

Did I somehow choose a mass in grams of O2 which is an exception to the rule?

"Five years from now

She sits at home

Feeding the baby, she's all alone"

Does that mean that she rejected Sk8er Boi, and then got pregnant by a deadbeat dad?

This is the Michealis-Menten Equation. Integration of it is useful for when the substrate concentration [S] is directly measurable like by Nuclear Magnetic Resonance, but estimating the rate of substrate consumption introduces some error.

-d[S] / dt = {V* [S]} / {K + [S]}

[S] = substrate concentration

V = maximum velocity

K = Michaelis constant

dt respects time.

Follows from: E + S ⇌ ES ---> E + P

If someone asks me to produce 1000 mL of a 7:9 volume to volume dilution of limonene and water,

Is that 7 parts of limonene + 9 parts of water in my volumetric flask = 16 parts in my flask?

Therefore the volume of limonene (L) that I should add is (7 / 16) * 1000 mL = 437.5 mL of Limonene

The volume of water to add is (9 / 16) * 1000 mL = 562.5 mL

###########

So 562.5 mL of water added to 437.5 mL of limonene makes a 7:9 v/v mixture of limonene and water?