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What indicator would you use if the end point for a titration occurred at pH 10.5?
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What indicator in titration of sodium carbonate solution against hydrochloric acid would give a complete neutralization?
Litmus paper
What is the meaning of the term end point in titration and what is true about the system at the end point?
In titrations, the end point is when you have brought the tested sample to absolute neutral. At this point, if you add one more drop of titrating solution to the sample, you would change the pH sufficient to change the color of the indicator in the sample. This is the point at which you can determine the pH of the original solution, by calculating back the amount of titrating solution you had to add to the sample to neutralize it.
What indicator would you use to determine the strength of a base?
Strong Acid - Strong Base titrationHCl(aq) + NaOH(aq) -----> NaCl(aq) + H2O(l) At equivalence the only species present will be NaCl(aq) & H2O(l)The solution of a salt of a strong acid and a strong base will have a pH=7NaCl(aq) will have a pH=7A suitable indicator would be bromothymol blue (pH range 6.2 - 7.6) or phenol red (pH range 6.8 - 8.4)Strong Acid - Weak Base titrationHCl(aq) + NH3(aq) -----> NH4Cl(aq) NH4Cl is the salt of a strong acid & a weak base, so a solution of NH4Cl will have a pH < 7 (NH4+ is a weak acid)A suitable indicator would be methyl orange (pH range 3.1 - 4.4) or methyl red (pH range 4.4 - 6.0)Weak Acid - Strong Base titrationCH3COOH(aq) + NaOH(aq) -----> CH3COONa(aq) + H2O(l) CH3COONa is the salt of a weak acid & a strong base, so a solution of CH3COONa will have a pH > 7 (CH3COO- is a weak base)A suitable indicator would be phenolphthalein (pH range 8.3 - 10.0) or thymol blue (pH 8.0 - 9.6)
What would you see if point mutation occurred during DNA replication?
A change to the newly synthesized DNA strand, but not the template.
What happens if you change the 9th base from adenine to cytosine in the DNA Strand?
This would be a point mutation, which may be harmless, or could be lethal, depending on the protein in which it occurred.
Discussion of titration?
Titration is the controlled addition and measurement of the amount of a solution of known concentration required to react completely with a measured amount of a solution of unknown concentration. Titration provides the equivalent volumes of acidic and basic solutions. In order to find this, MaVa/Ca formula needs to be used. In titration, when equal numbers of H3O+ and OH- from the acidic and basic solutions react, the resulting solution is neutral (water and salt). In titration, the end point would be the point at which the indicators change color; in this case the indicator turned pink. The equivalence point would the point at which the two solutions used in titration are present in chemically equivalent amounts. The indicator, phenothaylene, is used to determine the equivalence point of weak-acid/strong- base titrations.
What kind of indicators are used in precipitation titration?
An example of an indicator would be Phenol Red, or Universal Indicator. Depending on the pH range of the indicator and the pH range of the substrates you would use the appropriate indicator.
Why is starch solution used as indicator in Sodium thiosulphate Iodine titrations instead of phenolphthalein indicator?
Phenolphthalein is an acid base indicator - it does not show the end-point in a thiosulfate type titration. Starch gives a very sharp end-point from a blue-black to colorless end-point when titrating iodine with thiosulfate. Phenolphthalein would just not detect this change.
What is radiometric titration?
Radiometric titration is "regular" titration, but with the incorporation of a radioactive indicator to monitor the end-point. And that's right from the IUPAC Compendium of Chemical Terminology. If you need an example, use the link provided to a post on the radiometric titration of hexachloro-platinate (IV). It's a bit esoteric, but it will serve to exemplify the idea behind radiometric titration. It's pretty clear that when working with two precipitates (co-precipitation), the analyst would need a way to differentiate them. In the case cited, the application of radioactive cæsium-137 will permit the observer to more quickly and easily find a cutoff point at which to terminate the titration.
What indicator in titration of sodium carbonate solution against hydrochloric acid would give a complete neutralization?
Litmus paper
How would you select an indicator for an acid-base titration?
Ideally you want an indicator which undergoes its transition somewhere in the range where the pH is changing the fastest; that is, in the most nearly vertical part of the graph of pH vs. volume of titrant added.
What is the meaning of the term end point in titration and what is true about the system at the end point?
In titrations, the end point is when you have brought the tested sample to absolute neutral. At this point, if you add one more drop of titrating solution to the sample, you would change the pH sufficient to change the color of the indicator in the sample. This is the point at which you can determine the pH of the original solution, by calculating back the amount of titrating solution you had to add to the sample to neutralize it.
What indicator would you use to determine the strength of a base?
Strong Acid - Strong Base titrationHCl(aq) + NaOH(aq) -----> NaCl(aq) + H2O(l) At equivalence the only species present will be NaCl(aq) & H2O(l)The solution of a salt of a strong acid and a strong base will have a pH=7NaCl(aq) will have a pH=7A suitable indicator would be bromothymol blue (pH range 6.2 - 7.6) or phenol red (pH range 6.8 - 8.4)Strong Acid - Weak Base titrationHCl(aq) + NH3(aq) -----> NH4Cl(aq) NH4Cl is the salt of a strong acid & a weak base, so a solution of NH4Cl will have a pH < 7 (NH4+ is a weak acid)A suitable indicator would be methyl orange (pH range 3.1 - 4.4) or methyl red (pH range 4.4 - 6.0)Weak Acid - Strong Base titrationCH3COOH(aq) + NaOH(aq) -----> CH3COONa(aq) + H2O(l) CH3COONa is the salt of a weak acid & a strong base, so a solution of CH3COONa will have a pH > 7 (CH3COO- is a weak base)A suitable indicator would be phenolphthalein (pH range 8.3 - 10.0) or thymol blue (pH 8.0 - 9.6)
When testing an unknown solution how can you tell if it is acidic basic or neutral?
Simple method is to use a pH testing kit. A more complicated method would be to perform a titration using methyl orange (or some other indicator).
Define standardization and state how you would go about doing it.?
Standardisation is doing a titration to work out the exact concentration of the solution you want to use to determine the concentration of an unknown solution. You must know the moles of your known solution in order to determine the number of moles for your unknown solution. You must also use your indicator to show you when it has reached it's end point.
What is a titration and what equipment would you need?
A titration is a process of nutrilising an acid. You would need a burette, a beaker and and acidic and alkali substance. Higher chem FTW
What type of reaction would a titration be useful for?
Neutralization.
