wzorowane2 pktotwartełatwe (szac.)
State one safety concern arising from a product of this reaction, and a precaution that should be taken because of it.
Wczytywanie zadań
Szukamy zadań...
Wczytywanie zadań
Szukamy zadań...
Znalezionych zadań: 49
State one safety concern arising from a product of this reaction, and a precaution that should be taken because of it.
Before use, the EDTA solution was standardized against a standard solution of ions. An accurately weighed piece of pure copper wire was dissolved in the minimum volume of concentrated nitric acid and the mixture was warmed gently until no more…
Anhydrous copper(II) chloride, , takes up water vapour from the air, so it cannot be weighed out accurately to make a standard solution. Suggest a laboratory procedure that would remove all of the absorbed water from a sample of solid …
Portions of the rinse water were then titrated with the standardized EDTA solution in the presence of murexide as indicator. The burette readings are given in the table. Trial 1 Trial 2 Trial 3 Trial 4 Final burette reading / (± 0.05…
(i) Suggest, giving a reason for each, two different safety precautions that should be taken when carrying out either of these preparations. (ii) Deduce the coefficients needed to balance the following equation for the reaction of silver with concentrated…
Suggest a sequence of experimental steps that would give a pure sample of each of the three components.
The three percentages in 2b add up to more than 100 %. Suggest an error that would explain this result and how it could be reduced or eliminated.
The results did not support the student's hypothesis. Suggest what the student overlooked when forming the hypothesis.
(i) State the independent variable and the dependent variable of the investigation. (ii) Apart from the mass of leaves and the volume of water, suggest two other conditions that should be kept constant for the comparison between boiling times to be valid.…
(i) State what the graph shows about the relationship between the boiling time and the amount of oxalate ions extracted. (ii) Comment on the range of boiling times and on the number of measurements made in the investigation.