Why does the spectrum of bromocresol green changes at different pHs? What causes the change?
Why does the spectrum of bromocresol green changes at different pHs? What causes the change?
Pre-Laboratory Questions: 1. Bromocresol green is chosen as the acid-base indicator. Within what pH range does it change color? What color should the indicator be at the endpoint of the titration? 2. Calculate the maximum number of moles of ammonia that can be generated when 1.073 grams of NH SCN reacts with excess Ca(OH)2, using all three possible reactions. 3. Calculate the number of moles of ammonia that must have reacted with boric acid if 21.55 ml of a 0.3143...
Post Lab Questions: CI MALACHITE GREEN CRYSTAL VIOLET 1. Why does the malachite green dye elute first? What physical properties does it have that affect it's interaction with alumina and how are those different from crystal violet? 2. Write the reaction of crystal violet with 1 equivalent of HC. 3. Why does adding HCI cause crystal violet to elute more quickly? What changes with it's physical properties and how does that property affect it's interaction with alumina?
I am aware that the cu(ii) ions change to cu(i) ions and forms copper(i) oxide but why does the colour sometimes appear to be other colours for example green or yellow? What chemical reaction causes this?
Or me antIS What is a spectrum? Why does the diffraction grating produce a spectrum from the white light? 3. 4. What does the deviation angle at which a bright fringe is produced depend on? What do we need to know in order to find out the wavelength of light in this experiment? 5.
Why does demand not change when the price of a good changes with no change in the other influences on buying plans? Consider the demand for gym memberships The demand for gym memberships does not change when a change in occurs O A. the price of a gym membership O B. the population ° C, the expected future price of a gym membership O D. the price of bottled water (bottled water is a complement of a gym membership) An...
you. 12e) phenolphthalein (color change between pH-8-10), bromocresol green color change between pH 3-4) are provided to pH change at point of Proposed indicator inflection titration between HCl and 1 to 11 NaOH 12d) Calculate the pH of the solution when 10 mL of 0.1 M NaOH is added to 25 mL 0.1 M HCI .Write appropriate chemical equations if required and show your math!!!(4 points) In the ICE table started for calculating equilibrium concentrations of the reaction shown, the...
6. Some parts of the electromagnetic spectrum can cause changes in biological cells due to the energy of each photon. For the wavelengths given for different bands of the electromagnetic spectrum, determine the energy of a single photon, indicate if it can break the atomic bond of water (4.7 eV), ionize hydrogen (13.6 eV), and ionize calcium (6.11 eV). For those that can break bonds, how many molecules/atoms can one photon change? Show all your work for microwaves and ultraviolet,...
What changes occurred in the duration of systole and diastole between resting and post-exercise? Why does this change occur? 5. Look at the ECG recording, in a heart that is function normally, is there always one P wave for every QRS Complex? Explain.
The sign of delta H does not change. The sign of delta H changes. What effect does this change have on delta H: multiplying the coefficients of the equation for the reaction by 27 The magnitude of delta H halves. The magnitude of delta H doubles. The magnitude of delta H does not change.
Why do hydrogen and mercury lamps produce different colors? Why is the emission spectrum from hydrogen interesting?