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...
Calculate the molarity of the acetic acid in vinegar, if a 500ml sample of the vinegar requires 43.50 ml of 0.105 M NaOH to reach a phenolphthalein endpoint in a titration. What is the indicator in the titration with permanganate solution?
Here's how to make your own disappearing ink: Dissolve the thymolphthalein (or phenolphthalein) in theethyl alcohol. Stir in 90 ml of water (will produce a milky solution). Add sodium hydroxide solution dropwise until the solution turns a dark blue or red (might take slightly more or less...
2). As indicated in the same table, less resistant stainless grades can be passivated by adding sodium dichromate to the nitric acid bath to make the solution more oxidizing and capable of forming a passive film on the surface. Another option, used in place of nitric acid plus sodium ...
(a pH sensitive organic dye) to the vinegar at the start. Phenolphthalein colorless in acidic solutions (like vinegar) and dark pink in alkaline solutions. At the equivalence point of the vinegar titration, a single drop of sodium hydroxide (the titrant) will turn the entire vinegar solution ...
Explain the role of sodium acetate solution when acetophenetidin is formed in the amide synthesis. Explain how naphthalene can be recrystallized from ethyl alcohol. How can 2-methyl-2-butene be separated during purification? Explain the purpose of adding excess hydroxide compared ...
20.Pour 75 mL of this solution into a second 250 mL Erlenmeyer flask (flask 2), add 2 drops of phenolphthalein solution, and titrate to the phenolphthalein color change with 0.20 M NaOH. Record the volume of titrant. You now have a solution of a weak acid in flask 1, and a solution...
Explain how you could prepare 1.0 L of a 0.020 M KMnO4 solution. Concentration of Solutions: In order to prepare a specific amount of solution, you must first know the concentration you needed to achieve. The concentration tells the amount of solute needed to dissolve in a certain...
Add 5 drops of phenolphthalein to the milk/whey sample, stir gently. Use syringe to let the NaOH run drop by drop into the sample while stirring gently Continue until a light pink coloring persists for 10-20 seconds Look on the column to see how many ml of NaOH were used ...
How many mL of the 0.1029 M standard NaOH solution is required to titrate 0.2247 g sample of KHP to the phenolphthalein end point? What volume in milliliters of a 0.101 M NaOH solution is required to reach the equivalence point in the complete titrati...