Question

given an aqueous Solution that contains 150 mg/L Ca^+2, 160 mg/L Mg^+2, 100 x 10^(-6) g/L...

given an aqueous Solution that contains 150 mg/L Ca^+2, 160 mg/L Mg^+2, 100 x 10^(-6) g/L OH^-, and 120mg/L HCO3^-.

A) what is the Total Hardness in mg / L as CaCO3?

B) pH ?

C) Will bicarbonate Concentration (HCO3^-) accurately represent alkalinity (alk) ? why or Why Not ?

Science   Chemistry   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

[Ca^2+] = 150mg/L *50/(40/2) = 375 mg/L as CaCO3

[Mg^2+] = 160mg *50/(24/2) = 666.67 mg/L as caCO3

[HCO3^-] = 120mg/L *50/61/1 = 98.36 mg/L

total hardness = 375 + 666.67+ 98.6 = 1140.27 mg/L

----------------------------

pOH = -log[OH-] = -log[100*10^-6] = 4

pH = 14-pOH = 14-4 = 10

---------------------------------------

Alkalinity includes the concentration of carbonate , concentration of H+, OH- and HCO3-. So, concentration of HCO3- alone does not accurately represent alkalinity.

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
Determine the lime and soda ash dose, in mg/L as Ca(OH)2 and Na2CO3, to soften the...
Determine the lime and soda ash dose, in mg/L as Ca(OH)2 and Na2CO3, to soften the water of a village to a final hardness of 40.0 mg/L as CaCO3. Chemical analysis showed that the water contains Na+ (50 mg/L), Ca2+ (150 mg/L), Mg2+ (30 mg/L), HCO3- (100 mg/L as CaCO3), Cl- (80 mg/L). and CO2 (5.0 mg/L).
An analysis of groundwater samples from Fresno, CA taken in 2013 is given below. Determine the...
An analysis of groundwater samples from Fresno, CA taken in 2013 is given below. Determine the calcium, magnesium, and iron hardness of the water expressed as meq/L and mg/L as CaCO3. Determine the total hardness and alkalinity as well. Also, determine the nitrate concentration in terms of mg/L as N. Constituent Concentration(mg/L) Calcium 20.2 Magnesium 20.5 Sodium 20.3 Potassium 2.17 Bicarbonate 175 Sulfate 5.37 Chloride 9.1 Flouride .12 Nitrate 2.73 Silica 43.4 pH 7.7 pH units
100 million gallon per day of water of pH 8 and alkalinity (HCO3-) of 200 mg/L...
100 million gallon per day of water of pH 8 and alkalinity (HCO3-) of 200 mg/L as CaCO3. If it is required to lower the pH from 8 to 7 by using 1 g/L of HCl stock solution, then how much HCl is required (gallon/day) while considering the above mentioned alkalinity?
1) If 0.33 mg of KCl is present in 1.0 L of aqueous solution, what is...
1) If 0.33 mg of KCl is present in 1.0 L of aqueous solution, what is the concentration in terms of the following? A) Molarity B) weight/volume percent C) parts per thousand D) parts per million 2) The serum concentration of cortisol, a hormone, is expected to be in the range 8–20 mg/dL. What is the part per million concentration of cortisol in serum that contains 10 mg of cortisol per deciliter? 3)How many milliequivalents of bicarbonate ion (HCO3- )...
1. A standard solution of 100 ppm (100 mg / L) of an organic compound was...
1. A standard solution of 100 ppm (100 mg / L) of an organic compound was analyzed and this has a maximum absorption band at 270 nm. A calibration curve was prepared from which the following data were obtained: Conc. (Ppm) 1 1,5 2 3 4 Absorbance 0.1282   0.1940 0.2615 0.3995 0.5422        If 2 ml of an unknown solution of this compound are diluted to 50 ml, an absorbance of 0.425 is obtained. a. Calculate the concentration...
A 0.1 M Solution of Na2SO4 contains A. 9.6 x 10^3 mg/L SO4^-2 B. 4.6 x...
A 0.1 M Solution of Na2SO4 contains A. 9.6 x 10^3 mg/L SO4^-2 B. 4.6 x 10^6 ppb NA+ C. 14.2. g/L sodium sulfate D. 0.3 mol/L ions e. all of these choices are correct
1.) You will work with 0.10 M acetic acid and 17 M acetic acid in this...
1.) You will work with 0.10 M acetic acid and 17 M acetic acid in this experiment. What is the relationship between concentration and ionization? Explain the reason for this relationship 2.) Explain hydrolysis, i.e, what types of molecules undergo hydrolysis (be specific) and show equations for reactions of acid, base, and salt hydrolysis not used as examples in the introduction to this experiment 3.) In Part C: Hydrolysis of Salts, you will calibrate the pH probe prior to testing...
1. Given the following reaction     2C2H6(l)   +      7 O2(g)   ®           4CO2(g)      +     
1. Given the following reaction     2C2H6(l)   +      7 O2(g)   ®           4CO2(g)      +        6H2O(l) How many moles of water are produced when 4.5 moles of oxygen react?        (Hint: Use slides 5-8) 2. Given: I2     +    3 F2      ®     2 IF3 How many moles of I2 are needed to form 3 moles of IF3? How many moles of F2 are needed to form 10 moles of IF3? How many moles of I2 are needed to react with 3.5 moles of F2?        ...
A solution contains 7.61×10-3 M sodium chromate and 1.37×10-2 M sodium chloride. Solid silver nitrate is...
A solution contains 7.61×10-3 M sodium chromate and 1.37×10-2 M sodium chloride. Solid silver nitrate is added slowly to this mixture. What is the concentration of chloride ion when chromate ion begins to precipitate? [chloride] = --------------M Table of Solubility Product Constants (Ksp at 25 oC) Type Formula Ksp Bromides PbBr2 6.3 × 10-6 AgBr 3.3 × 10-13 Carbonates BaCO3 8.1 × 10-9 CaCO3 3.8 × 10-9 CoCO3 8.0 × 10-13 CuCO3 2.5 × 10-10 FeCO3 3.5 × 10-11 PbCO3...
1.) Indicate which aqueous solution has the lowest vapor pressure: a. 0.2 M MgCl2   b. 0.1...
1.) Indicate which aqueous solution has the lowest vapor pressure: a. 0.2 M MgCl2   b. 0.1 M MgCl2   c. 0.2 M NaCl d. 0.1 M KCl e. 0.1 M Na2CO3 2.) Indicate which aqueous solution has the fastest evaporation rate. a. 0.2 M MgCl2   b. 0.1 M MgCl2   c. 0.2 M NaCl d. 0.1 M KCl e. 0.1 M Na2CO3 3.) What is the molarity of a sucrose (C12H22O11) solution that produces an osmotic pressure of 2.65 atm at 25°C?...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT