You decide it is time to clean your pool since summer is quickly approaching. Your pool maintenance guide specifies that the chlorine, Cl, , concentration of the pool should be between 1 and 3 ppm. In order to determine if your pool is safe to swim in, you send a sample of pool water to a chemist for analysis of the Cl, content. The chemist reports a chlorine concentration of 3.92 x 10-5 M. Convert the concentration of Cl, to parts per million (ppm). concentration: ppm

A2

Suppose that 2.89 L of 6.75 M potassium carbonate is added to 1.38 L of 1.57 M magnesium nitrate.  What is the total concentration of ions in solution after the reaction goes to completion? (Do not include units in your answer. If you round during your calculation make sure to keep at least 3 decimal places. Report your answer to 1 decimal place.)

Exactly 6.21 g of MgCl, (molar mass - 95.2 g/mol) was dissolved in water. An analysis indicated that the molarity of the solution was 0.320 M. What was the volume (in mL) of the solution? Report your answer to three digits - for example 155 or 85.4 and do not include the unit ml. 28

Ammonium oxalate dissociates when it dissolves in water.   If the concentration of the oxalate ions is 3.2 mol/L, then what is the concentration of the ammonium oxalate solution? Record only your numerical answer with the correct number of significant digits.  You do not need to include units as the units appear for you beside the answer box already.

8. A student adds 22.36 mL of 1.366 x 10¹ M Mg(OH), in order to completely neutralize 25.00 mL of H₂PO acid. Calculate the original concentration of the acid solution.

Lead is a possible contaminant in public water systems. There are many reasons we should be concerned about this, but this may be especially concerning if the water is used for drinking. Removing all lead is not feasible, so many local governments must set an “acceptable” concentration for contaminants. The “acceptable” concentration of lead in public water for some states is 7.2 x 10^-7 M.   If 10.00 mL of 1.00 M lead is poured down the sink, how many liters of water are required to make sure the concentration of lead is 7.1 x 10^-7 M, which is just below the acceptable level?

A chemist performs a gravimetric analysis. The chemist combines 1.00 L of 2.00 M AGNO, (ag) with 1.00 L of 4.00 M NaCl (aq) in an Erlenmeyer flask. Both the AGNO, (aq) solution and the NaCl(ag) solution are colorless. After the mixture has been stirred, a cloudy white substance is observed at the bottom of the flask. Which of the following is the complete ionic equation for the reaction that occurs in the beaker? A Ag+ (ag) + Cl- (aq) → AgCl (s) B Na (aq) + NO3 (aq) → NANO3 (s) Ag (aq) + NO, (aq) + Na (aq) + Cl-(aq) → AgCl(s) + Na* (aq) + NO, (aq) NaCl(aq) + AGNO, (aq) Ag (s) + NANO, (aq)

Calculate the molar mass of the unknown acid. Be sure your answer has the correct number of significant digits.

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