Answer: the number of a chemical element in the periodic system,
Explanation:
Answer:I said During the time labeled A when the temperature first starts to increase
Explanation:
I will let you know if it’s right
2.9 is the ph of a buffer solution made by adding 0. 010 mole of solid naf to 50. ml of 0. 40 m HF.
pH
The hydrogen ion concentration in water is expressed by pH. Specific to aqueous solutions, pH is the negative logarithm of the hydrogen ion (H+) concentration (mol/L):
pH equals -log(H+)10
The phrase refers to a solution's basicity or acidity in a range of 0 to 14, with pH 7 representing neutrality. The pH decreases and acidity rise as the concentration of H+ ions in the solution.
Since pH is a logarithmic function, a pH shift of one unit (for example, from 7 to 6) corresponds to a 10x change in the concentration of H+ in the solution. However, hydrogen ion activity, not concentration, is what is actually measured.
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I have attached an image showing the starting material required for the questions, which is a molecule with an ester functionality. Esters are very reactive towards Grignard reagents and the reagent will add twice to the carbonyl of the ester, as is implied by the question saying that 2 equivalents of the Grignard reacts.
The first Grignard reacts with the ester and adds the ethyl group to the carbonyl carbon of the ester, to undergo an addition-elimination reaction to form the ketone. However, ketones are also very reactive to Grignard reagents, and the carbon of the cabronyl will react once more with the second Grignard to add a second ethyl group. At this point the alkoxide is formed, which is why water is added as a work-up step, to protonate the alkoxide to isolate the final alcohol product.