Why does NaOH dissolve in methanol?

NaOH Separates into ions in methanol. The -OH reacts with the H of methanol to make H2O, leaving the -OCH3 to react with the fatty acid. The catalyst is prepared by mixing methanol and a strong base such as sodium hydroxide or potassium hydroxide. During the preparation, the NaOH breaks into ions of Na+ and OH-.

Does NaOH dissolve in methanol?

Physical properties. Pure sodium hydroxide is a colorless crystalline solid that melts at 318 °C (604 °F) without decomposition, and with a boiling point of 1,388 °C (2,530 °F). It is highly soluble in water, with a lower solubility in polar solvents such as ethanol and methanol.

How are fatty acid methyl esters prepared?

Saponification followed by methylation is a classical method for preparation of fatty acid methyl esters (FAMEs) from glycerolipids and sterol esters (SEs). Conventionally, FAMEs are prepared by base- or acid-catalyzed esterification.

Is methanol a fatty acid?

Fatty acid methyl esters (FAME) are a type of fatty acid ester that are derived by transesterification of fats with methanol. The molecules in biodiesel are primarily FAME, usually obtained from vegetable oils by transesterification. They are used to produce detergents and biodiesel.

What is the purpose of NaOH in the production of biodiesel?

The NaOH catalyst first reacts with the methanol, reducing it to a methoxide which then attacks the triglycerides in the oil breaking it into fatty acid methyl esters (FAME) and glycerol. Fig. 1. Graph of biodiesel yield against amount of NaOH used (“the line is a guide to the eye”).

Why is methanol used in transesterification?

Methanol and ethanol are the most often used alcohols in biodiesel production. Methanol is particularly preferred because of its physical and chemical advantages. Beside its reaction with triglycerides is quick and it can be easily dissolved in NaOH [57].

How is NaOH prepared from methanol?

To prepare Sodium Methoxyde Solution (1 M) , take 4.6 ml in dry methanol , add 2.3 gram of freshly cut sodium metal till it is slowly dissolved. Use this turbid solution as 1M sodium methoxide for the reaction.

Why NaOH is not a primary standard?

NaOH has no criteria given above. It is not suitable for the primary standards because they absorb the moisture from the atmosphere. It also absorbs carbon dioxide from the atmosphere. Hence, NaOH is not a primary standard because it has no quality of primary standard.

What are the preparation of ester?

Esters are produced when carboxylic acids are heated with alcohols in the presence of an acid catalyst. The catalyst is usually concentrated sulphuric acid. Dry hydrogen chloride gas is used in some cases, but these tend to involve aromatic esters (ones where the carboxylic acid contains a benzene ring).

Which technique is preferred in the separation of fatty acyl methyl esters from a mixture?

Gas liquid chromatography
Explanation: Gas liquid chromatography or HPLC is preferred in the separation of fatty acyl methyl esters from a mixture.

Are esters fatty acids?

Fatty acid esters (FAEs) are a type of ester that result from the combination of a fatty acid with an alcohol. When the alcohol component is glycerol, the fatty acid esters produced can be monoglycerides, diglycerides, or triglycerides. Dietary fats are chemically triglycerides.

What are fatty acid methyl esters used for?

What happens if you add methanol to a solution of NaOH?

On adding methanol, the volume of solution would increase. Due to it, the concentration of the NaOH will decrease and so pH will decrease. It means if you add too much methanol, the pH of the solution will decrease. Adding a couple of drops of methanol to the solution will not make much difference.

Why do chemical engineers prefer methanol over ethanol for extraction?

This means if methanol removes 20\% and ethanol removes 30\%. The chemical engineer would pick methanol for the aforementioned reason because he can reuses the solvent after separation. Therefore some properties of a molecule although better at extraction on a small scale are useless at a larger scale.

How do you calculate the molecular weight of NaOH?

So, the molecular weight of NaOH = 23+16+1 = 40 . Or NaOH = 40 gms /mole. So, to prepare 1N solution of NaOH, we need to dissolve 40 gms of NaOH in 1000 ml of distilled water. To prepare 2N solution of NaOH, we must dissolve 2×40=80 gms of NaOH in 1000 ml of distilled water.

Why is anhydrous methanolic HCl used as an acid catalyst?

HCl is most widely used as an acid catalyst because it is a relatively mild reagent and gives almost quantitative yields (1–3). Anhydrous methanolic HCl can be prepared from acetyl chloride and methanol (2–4, 9), but the acid chloride is volatile (bp 52°C) and is an extreme irritant to the eyes.