Moles of naoh which reacted with unknown




















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What ratio? How do you use it? Therefore, if it is , or , or , or you can figure out how many moles you have of each. What ratio gives you the same number of moles of Na OH as you have moles of the acid?

What does, "aqueous," tell you and do you need to use this information in your calculations? Can you figure out the empirical formula by calculating it from moles? There are 6. See Avogadro's number if you have questions on that.

Do you need this information? Why or why not? Definition: The mass of one mole of a substance, usually expressed in grams or kilograms. Once you have answered the assigned question, you might also want to compare and contrast M with m for your own learning enhancement.

This further study will help you lock what you have learned into your brain so you remember it for tests and for your job. The molar mass is a measure of the average molecular mass of all the molecules in a sample, and is usually the more appropriate measure when dealing with macroscopic weighable quantities of a substance.

Review all the definitions and double check your answers. Try some similar problems and see if you can get them. Have fun with it. Play with the numbers and the units. Try different ratios. Let me know how it works for you to use definitions and units in problem solving. Oh, and practice your times tables.

Note: If the doctors and nurses working with my grandfather had known that tip, he wouldn't have received a lethal dose of his medicine by mistake. He was given medicine a factor of 10 times too strong. So, don't think that the details on this question don't matter, they do. You can prevent medicine errors and other errors. In so doing, you will save lives. Start by calculating the number of moles of Na OH that you have.

You've got a concentration of. By knowing the volume of base at the equivalence point, as well as the concentration of the base, one can calculate among other things the initial concentration of the acid. Figure 2. This is a typical titration graph plotting volume of titrant added versus pH of solution. Notice that only a small change in pH occurs as most of the titrant is added, then near the end of the titration there is a sudden, rapid change in pH. The sudden change occurs at the equivalence point.

The location of the equivalence point is, therefore, determined by identifying the point of fastest increase. The chemical reaction that occurs between the acid and the base allows one to calculate the initial concentration or amount of the acid.

For example, in the titration of hydrochloric acid HCl with a base such as sodium hydroxide NaOH , the chemical reaction between these two species would have to be known. The reaction is as follows:. This reaction states that 1 molecule of HCl will react with 1 molecule of NaOH to produce 1 molecule of the salt, sodium chloride NaCl , and 1 molecule of water. The chemical equation allows us to calculate the concentration of a solution of HCl by titration with the base NaOH where the concentration of NaOH is accurately known.



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