Question
In: Civil Engineering
A water with a pH =7.0 has been analyzed and found to have the following composition,...
A water with a pH =7.0 has been analyzed and found to
have the following composition, with all concentration in mg/L as
CaCO3:
CO2 = 125 mg/L
Ca2+ = 250 mg/L
Mg2+ = 80 mg/L
Fe2+ = 10 mg/L
Alkalinity = 260 mg/L
SO4 2- = 50 mg/L
Cl- = 30 mg/L
a) what is the hardness of this water? Report in mg/L as
CaCO3
b) use the excess Lime soda Ash method and estimate the kilograms
of lime and kilograms of soda Ash that will be needed per 1MGD to
soften this water. Report assumptions used in the calculations.
Solutions
Ally Wells answered 10 months agoRelated Solutions
A sample of water has the following concentration of ions (and pH = 7.0). cations...
A sample of water has the following concentration of ions (and
pH = 7.0).
cations
mg/L anions
mg/L
Ca+2
95.0
HCO3- 160.0
Mg+2
26.0
SO42- 135.0
Na+
15.0
Cl-
73.0
a) Draw an ion concentration bar (use meq/L for units).
b) What is the total hardness (TH) in mg/L as
CaCO3?
c) What is the carbonate hardness (CH) in mg/L as
CaCO3?
d) What is the non-carbonate hardness (NCH) in mg/L as
CaCO3?
e)...
A water sample was analyzed and was found to have the following constituents: Ca+2, mg/L 123...
A water sample was analyzed and was found to have the following
constituents:
Ca+2, mg/L 123
HCO3 - , mg/L 82
Mg+2, mg/L 12
SO4 -2, mg/L 122
Na+ , mg/L 22.1
Cl- , mg/L 112
K+ , mg/L 3.8
CO3 -2, mg/L 6.0
Fe+2, mg/L 5.8
Mn+2, mg/L 1.5
Temperature 25°C
1. Calculate each of the concentrations as mg/L as CaCO3.
2. Using the equilibrium expression for carbonate and
bicarbonate, calculate the hydrogen ion concentration:
a. as moles/L.
b....
The pH of a water is measured to be 7.0. The concentration of bicarbonate was measured...
The pH of a water is measured to be 7.0. The concentration of
bicarbonate was measured to be 1.3*10^-3 M. What are the
concentrations of carbonate, carbonic acid, and CT (total
carbonates)? Assume this system is closed to the atmosphere and the
temperature is 25 C.
A particular concentration of a chemical found in polluted water has been found to be lethal...
A particular concentration of a chemical found in polluted water
has been found to be lethal to 20% of the fish that are exposed to
the concentration for 24 hours. Twenty randomly selected fish are
placed in a tank containing this concentration of chemical in
water. a. Demonstrate that X is a binomial random variable where X
is the number of fish that survive.
_____________________________________________
_____________________________________________
___________________________________________(3) Find the following
probabilities: b. More than 10 but at most 15 will...
Microplastics have been found in both tap water and bottled water. Bottled water results A study...
Microplastics have been found in both tap water and bottled
water.
Bottled water results A study analyzed 259 bottles
and found an average of 320 plastic particles for every liter of
water being sold. The associated standard deviation was 327. (Yes,
the standard deviation is larger than the mean.)
Tap water results In a similar study, 30 tap water
samples were analyzed. The average number of plastic particles
found in each liter in the United States was 8.8 with a...
An unknown metal has been found and the following experimental results have been tabulated in the...
An unknown metal has been found and the following experimental
results have been tabulated in the table below. The table contains
the grams of the unknown metal and the volume in milliliters of
water displacement. Find a linear model that express
mass as a function of the
volume.
Round your answers to 3 decimal places
grams
Volume in ml
20
226.8
21.5
241.4
23
258.2
24.5
277.8
26
297.8
27.5
305.6
29
328.9
Answer:
Volume = ? x+ ? (...
An unknown metal has been found and the following experimental results have been tabulated in the...
An unknown metal has been found and the following experimental
results have been tabulated in the table below. The table contains
the grams of the unknown metal and the volume in milliliters of
water displacement. Find a linear model that expresses
mass as a function of the
volume.
grams
Volume in ml
14
161.9
16.5
189
19
215.5
21.5
248.7
24
272.2
26.5
303.5
29
335.4
A) Write the linear regression equation for the data in the
chart.
Volume =...
An unknown metal has been found and the following experimental results have been tabulated in the...
An unknown metal has been found and the following experimental
results have been tabulated in the table below. The table contains
the grams of the unknown metal and the volume in milliliters of
water displacement. Find a linear model that express
mass as a function of the
volume.
Round your answers to 3 decimal places
grams
Volume in ml
13
144.5
14.5
162.8
16
183.3
17.5
202.4
19
211.2
20.5
227.8
22
247
Volume =_________ x+___________ where x is the grams...
The pH of earth's water is controlled by the combination of several equilibria found in water,...
The pH of earth's water is controlled by the combination of
several equilibria found in water, as well as between water and the
atmosphere. This problem considers a model for oceanic water. H2CO3
+ CO3 yields 2HCO3 1) Calculate the equilibrium constant for this
equilibrium using Ka1 and Ka2 of carbonic acid. 3) Starting from a
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Personal daily usage of water in Zambia has been found to be normally distributed with a...
Personal daily usage of water in Zambia has been found
to be normally
distributed with a mean of 24 litres a variance of 39 litres.
i. What percentage of the population uses more than 33
litres?
ii. What percentage of the population uses between 16 and 27
litres?
iii. What is the probability of finding a person who uses less
than
12 litres?
iv. As there is always a shortage of water in Zambia, the
Finance
Minister has decided to...
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