Chem

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1. Analytical chemistry

   A 25 ml sample of household bleach was diluted to 500 ml in a volumetric flask. An unmeasured excess of potassium iodide was aded to a 20 ml aliquot of the diluted sample; the iodine liberated in the reaction: OCl- + 2I- -> I2 +

2. Chem

   The mass of a beaker is 5.333g. After 5.00 mL of a concentrated hydrochloric acid solution is pipetted into the beaker, the combined mass of the beaker and the hydrochloric acid sample is 11.229 g. From the data, what is the

3. pharmacy

   A 25.0 mL aliquot of vinegar was diluted to 250 mL in a volumetric flask . Titration of 50 mL aliquot of the diluted solution required an average of 34.88 mLof 0.096 M NaOH. Express the acidity of vinegar in terms of the

4. English

   1. He is in the river. [For example, half of his body is in the water. Or he is swimming in the river. He may be enjoying scub-diving in the river.] 2. He is on the river. [He is rowing a boat on the river. He is floating down on

1. chemistry

   The analysis of halogenated hydrocarbon gave the following results: A sample of mass m=255mg produces 273.7 mg carbon dioxide and 130.6 mg of water .A second sample of mass 87 is treated by hot molten sodium .The obtained mixture

2. Physics

   A boat attempts to cross a 172 m wide river to reach a dock directly on the other side. The boat heads out directly across the river, perpendicular to the bank, with the motor propelling it at 16 m/s across the water, but he river

3. quant chemistry

   A standard solution of Mn2+ was prepared by dissolving 0.250 g of Mn in 10 mL of concentrated HNO3 (measured with a graduated cylinder). The resulting solution was quantitatively transferred to a 100 mL volumetric flask and

4. chemistry

   At some other temperature, a solid sample of Ca(OH)2 is shaken with 0.0100 M CaCl2. Once equilibrated, some solid Ca(OH)2 remains undissolved. The solution is filtered and a 20.00 mL sample requires 38.80 mL of 0.0100 M HCl to

1. Chemistry

   A sample of fresh grapefruit juice was filtered and titrated with the above I2 solution. A 100 mL sample of the juice took 9.85 mL of the iodine solution to reach the starch endpoint. a. What is the concentration of vitamin C in

2. Chemistry

   Please help, I can't do this and its stressing me out ?!?! A 25.0 mL aliquot of an aqeuous quinine solution was diluted to 50.0mL and was found to have an absorbance of 0.832 at 348nm when measured in 2.00cm cell. A second 25.0mL

3. Chemistry

   0.5g sample of bronze containing Zn is dissolved in 100ml of acid. An aliquot of 25ml requred 10.25ml of EDTA. What is the percentage of zinc in the bronze sample?

4. chem

   a 50ml aliquot sample of vinegar is titrated with a 0.078 M NaOH sol'n. The phenolpthalein end point was reached after the addition of 35.6 ml. Equation: HC2H3O2 + NaOH _____> NaC2H3O2 + H20 Calculate the % by mass/vol. of acetic

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