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Why is an excess amount of sodium hydroxide added to aspirin?
Aspirin (which is an acid) gives some people an upset stomach. Sodium Bicarbonate is a buffer- it slows acid changes, and prevents upset stomachs.
Why is excess amount of sodium hydroxide added to the conical flask?
Excess sodium hydroxide is added to ensure that all the acid in the solution is fully neutralized. This helps to guarantee that the reaction goes to completion and that the pH of the solution is sufficiently raised.
Aspirin is made by the reaction of salicylic acid with acetic an hydride what is the theoretical yield of aspirin if 85.0 grams of salicylic acid is treated with excess acetic an hydride?
Since salicylic acid is being reacted with excess acetic anhydride, salicylic acid is the limiting reactant of the reaction. The balanced equation of the reaction of salicylic acid and acetic anhydride indicates that their is a 1:1:1:1 ratio between every reactant and product. Based on this, it can be concluded that the moles of salicylic acid, if reacted entirely, will yield an equivalent amount of moles of aspirin. To find the theoretical yield, you must know the molecular weight of aspirin and salicylic acid. First, the amount of moles of salicylic acid must be calculated by dividing the gram amount of salicylic acid, which is 85 grams, and dividing it by its molecular weight, which is 138.12 grams per mole.85.0/138.12= 0.615 moles of salicylic acidThis is the mole amount of salicylic acid as well as the theoretical mole amount of aspirin. To convert the mole amount of aspirin into grams, this figure be multiplied by the molecular weight of aspirin, which is 180.15980.615 x 180.1598 = 111 grams of aspirin (when rounded to 3 significant figures)
Can you mix magic mushrooms and aspirin?
Either taken in excess can be harmful. There is no specific interaction between psilocybin mushrooms (normally know as magic mushrooms) and aspirin.
How the amount of potassium iodide added to the potassium iodate (V) solution in the conical flask affects the amount of iodine liberatedexplain.?
If more potassium iodide is added to the potassium iodate (V) solution in the conical flask, there will be more iodine liberated. This is because potassium iodide reacts with potassium iodate (V) to produce iodine. Therefore, increasing the amount of potassium iodide increases the rate of reaction and the amount of iodine generated.
Feces containing excess water?
Feces containing excess water is called diarrhea. One of the most common causes of diarrhea is an infection of the intestines.
Why is aspirin harmful to patients recovering from surgery?
It delutes the blood so excess bleeding may occur.
Why is titration method applicable in aspirin analysis?
When I am using back titration and direct titration as my two methods for determining the purity of aspirin tablets. doesn't the direct titration not take into consideration of the excess sodium hydroxide added to the aspirin?In both these titrations when I reach the end-point it turns pink but I kept these solution the next day and they turned back to colourless. Is this meant to happen and what chemical reaction has happened here?I titrated this again with more sodium hydroxide till the end-point then added this to the overall amount of NaOH i added in the flask.Is the only difference between back titration and direct titration not addding the HCl at the end to determine the excess amount of NaOH?Are there any methods for direct titration.Would really appreciate any help.The best you can obtain is an end point lasting 20-30 seconds. Any excess base will slowly hydrolyze the ester and liberate acetate ion from the act's because aspirin is such a weak acid that it reacts slowly with the NaOH, making it difficult to accurately get a good endpoint in a reasonable time.With back titration, you react with an excess of NaOH (known amount), heat it to make the reaction go to completion quickly, then use HCl to determine the amount of NaOH that is remaining. This reaction will go quickly, and is much easier to measure.elylsalicylic acid,aspirin.
How can I correct excess Roth IRA contributions?
To correct excess Roth IRA contributions, you can withdraw the excess amount before the tax filing deadline for the year in which the contribution was made. This will help avoid penalties and taxes on the excess amount.
What does the liver convert all excess energy-containing nutrients into?
The liver converts excess energy-containing nutrients, such as carbohydrates, into glycogen for short-term energy storage. When glycogen stores are full, the liver then converts excess nutrients into triglycerides for long-term energy storage as fat.
Does the excess reagent determine the amount of a product?
No, the excess reagent does not determine the amount of product formed in a chemical reaction. The amount of product is determined by the limiting reagent, which is the reactant that is completely consumed first. The excess reagent will remain in excess after the reaction is complete.
What is a greater amount than what is needed?
Excess.
