Florence is only able to find 0.015 M aqueous KI/I2 on the reagent cart, so they perform a dilution by combining 10 mL of water and 10 mL of the available reagent. They now have 0.0075 M aqueous KI/I2 which can be used at station C. Is there a difference in the chemical composition of the solution Florence made from what was available on the reagent cart? Group of answer choices no, because water was already present in the solution yes, because water was added to the solution

A 25mL volumetric pipet is used to deliver a sample of the stock solution marked “0.6000M X2SO4” into a 100mL volumetric flask. Distilled water is added to the flask until it is about 3/4thfull, the solution is mixed well, then more water is added to fill it up to the calibration mark, then it is mixed again. Calculate the concentration of X+ion in the dilute solution made above.

While carrying out this practical class, all of the 25% (m/v) HCl solution was used up by the students and more of the solution had to be prepared. Concentrated hydrochloric acid containing 37% (m/v) HCl is available. What volume of concentrated hydrochloric acid should be made up to 100 mL with water in order to prepare more 25% HCl solution? Give your answer in mL to ONE decimal place. You do not need to include the units in your answer below.

© Macmillan Learning Five standard solutions of a newly discovered inorganic salt were used to create a calibration curve. The density (g/mL) of each solution was plotted on the y-axis versus the % (w/v) concentration on the x-axis. The calibration curve was linear and fitted with the following best-fit line. y = 1.17x + 0.188 A student is asked to analyze a solution of this salt with a density of 4.00 g/mL. What is the concentration, in %(w/v), of the unknown salt solution? concentration: % (w/v)

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SELECT correct responses only 1) Volume percent (v/v%) is temperature-independent. 2) There are three major approaches to expressing solution concentration in terms of percent concentration: weight percent, volume percent, and weight/volume percent. 3) Weight/volume percent (w/v%) is a unit-less quantity. 4) The term 'percent' refers to 'parts per thousand'. 5)A standard solution is a reagent of known concentration that is used to carry out a volumetric titration. 6) The endpoint of a titration is the theoretical point reached when the amount of added titrant is chemically equivalent to the amount of analyte in a sample. 7) A substance that changes color in response to chemical equivalence is known as an indicator. 8) Given a sufficiently diligent and experienced experimenter, it is sometimes possible to reach a titration volume error value of 0.

6) Provide a sample calculation for determining the mass of glucose, in milligrams, in the cuvette that contains the assay solution for the 0.02M Glucose Standard. The molecular weight of glucose is 180 g/mol, or 180 mg/mmol.

5.35g of salicylic acid added to 7.75mL of methanol followed by 10 drops of sulfuric acid,H2SO4 and the resulting mixture was refluxed for 30 min. If 3.85mL of methyl salicylate were distilled from the mixture. What's the percent yield? Answer to 1 decimal place

Transfer 0.5 mL phenolphthalein to a flask 25 mL KHP. Then transfer 13.2mL NaOH in the KHP that make it be pink. As the picture shows. Now, show a complete calculation for the concentration of the sodium hydroxide solution.

Calculate the initial concentrations for all the solutions. The concentration of stock solutions are as listed below the compound.