Describe two applications of the use of dilutions at home.

Calculate the number of Kilograms of NaF per year of 100,000people if the daily consumption of water per person is 132.0 gallons (Sodium Fluoride is 45.0 percent Fluorine by mass. 1 gallon =3.79L, 1year+365 days,density of water+1.0g/l

How many liters of 0.250 M NaOH solution can be prepared from 10.0 g of NaOH? Place your answer in the box. Express your answer using only a number without text. Report your result in decimal notation and to the proper number of significant figures. All numbers are measured.

The discharge of an abandoned mine flows into a freshwater lake. The discharge enters the lakes at a rate of 1.1 m3/ second. The copper load in the discharge is 121 kg/hour. What is the average concentration of copper in the discharge in mg/L?

A sunscreen preparation contains 2.50% by mass benzyl salicylate. If a tube contains 4.0 ounces of sunscreen, determine how many kilograms of benzyl salicylate are needed to manufacture 325 tubes of sunscreen. Conversion: 2.205 lb= 1 kg.  16.0 oz = 1 lb

1. Several students performed this experiment without paying adequate attention to the details of the procedure. Briefly explain what effect each of the following procedural hanges would have on the size of the volume- to- temperature ratio calculated by the students. (a) One student failed to replenish the boiling water in the boiling- water bath as the flask was being heated. At the end of the 6 min of heating, the boiling water in the bath was only in contact with the lower portion of the flask. (b) Following the proper heating of the flask in the boiling water, a student removed the flask from the boiling- water bath but only partially immersed the flask in the ice-water bath during the cooling period. (c) A student neglected to close the pinch clamp before removing the flask from the boiling water bath and immersing it in the ice-water bath. (d) One student neglected to measure the volume of the flask before leaving the laboratory. Because the procedure called for a 125-mL…

An aqueous solution has a Molarity of 1.632 M. The density of the solution is (1.210x10^0) g/mL and the solute has a molar mass of (2.05x10^2) g/mol. What is the molality of this solution? Enter your answer in scientific notation with 3 sig figs. Do not include any units in your answer. Do not round any intermediate calculations. Note: Your answer is assumed to be reduced to the highest power possible.

A student prepares a 0.38 mM aqueous solution of acetic acid (CH3CO₂H). Calculate the fraction of acetic acid that is in the dissociated form in his solution. Express your answer as a percentage. You will probably find some useful data in the ALEKS Data resource. Round your answer to 2 significant digits. 11 % 0.0 x10 X S 0 E

Dimensional Analysis is a way of doing numerical "book-keeping" when converting quantities or performing calculations. • When converting quantities from one unit to another, conversion factors are used. Solving with Dimensional Analysis and Multiple Units: If I am in Canada where the price of gas is $1.022 USD·L1, how much will it cost me to fill up my gas tank if I travelled 125 km? • Let's also assume that my car gets an average of 30.0 miles/gallon.

You are on a road trip. Your car travels at an average speed of 65 miles/hr, with an average gas use of 17.8 km/L.       1 liter = 1,000 mL = 0.264 gallons. 1 km = 0.621 miles.  1) If your trip takes 2.6 hours, determine how many total liters and gallons of gasoline are used on this trip. 2) How many mL (milliliters) of gasoline are used by the car each minute during this trip? 3) The density of the gasoline used on your trip is 0.755 g/mL. What is the total mass in grams, and in ounces of the gasoline used on your trip?