These inks are sneakier because you have to know how to reveal them. Most of them work using pH indicators, so when in doubt, paint or spray a suspected message with a base (such as sodium carbonate solution) or an acid (such as lemon juice). Some of these inks will reveal their mes...
How does the Bromocresol green indicator work to produce a color change for the end point of titrating standard HCl to Na2CO3? Explain. The color change of the phenolphthalein, the indicator, at an end point can be explained in terms of which of the following? What i...
Disappearing ink is a water-basedacid-base indicator(pH indicator) that changes from a colored to a colorless solution upon exposure to air. The most common pH indicators for the ink arethymolphthalein(blue) orphenolphthalein(red or pink). The indicators are mixed into a basic solution that ...
(if it is still green and must be repeatedly dripped with liquid bromine). Dilute to 1 liters, filter, filtrate in brown reagent bottle to save. When used with a standard NaOH titration, phenolphthalein as indicator, then the appropriate dilution, about 1 times of water, so that the final...
1. Use casserole to transfer acid from tank to sample bottle. 2. Measure 1.0 ml of nitric acid solution into a 250-ml flask containing 100 to 150 ml of a good grade of water (drinking water will suffice) and a few drops of the phenolphthalein indicator. 3. Swirl flask and add sodium...
Why use methyl orange instead of phenolphthalein as a pH indicator? What is the purpose of measuring erythrocyte sedimentation rate? How does dehydration affect lab values? How does a dew point analyzer work? Why is titration important in real life?
How does chemistry relate to sepsis (an infection where antigens invade the red blood cells)? Why do atmospheric aerosols have a cooling effect? What are some causes of a high percent error when titrating Ca(OH)2 with HCl and phenolphthalein indicator?
to the opposite to reach neutralization. Typically, a color change indicator or pH meter signals the equivalence point (neutralization) when there is no visible reaction. In a vinegar titration, you add an indicator solution called phenolphthalein (a pH sensitive organic dye) to the vinegar at ...
The reagent is so sensitive to blood that very little sample material is needed to produce a reliable result. The phenolphthalein presumptive blood test method was sensitive to and easily demonstrated the presence of blood in the control sample. Importantly, this procedure worked well to eliminate ...
In order for a ring system to be aromatic it must have (4n+2) pi electrons. Explain how the allowed energies for a particle in a ring can be used to justify this observation. Describe how on a molecular level the indicator phenolphthalein works in different transitions. ...