Exam (elaborations)
CWEA grade 1 lab analyst practice test part 2
- Course
- Institution
CWEA grade 1 lab analyst practice test part 2CWEA grade 1 lab analyst practice test part 2CWEA grade 1 lab analyst practice test part 2
[Show more]
Content preview
CWEA grade 1 lab analyst practice test part 2What is chloride? - ANS Major anion found in many natural waters - Can impart salty
taste in H2O
What increases the concentration of chloride in wastewater? - ANS Chloride in human
diet and softeners flushed into sanitary sewer system
2 most prevalent methods of measuring chloride? - ANS argentometric and mercuric
nitrate
What is the Argentometric method? - ANS Titration of the sample with a standard
solution of silver nitrate (AgNO3) - Indicator: Chromate ions (CrO4) - End point: reddish
silver chromate
What is the Mercuric Nitrate method? - ANS Titration with standard mercuric nitrate
solution -pH must be adjusted between 2.3 and 2.8 - Indicator: Diphenyl carbazone -
End point: Change from blue to purple in the presence of mercury
Which of the following can be an Interference of the Mercuric Nitrate Method? - ANS
Sulfide, bromide, orthophosphate (over 30 ppm), and iodide
Why does the color change in water?
a. Presence of decaying vegetable matter
b. metal ions (ie. iron)
c. industrial and domestic pollution
d. All of the above - ANS d
How is color measured - ANS Measured using visual comparison method
What is the visual comparison method - ANS Sample compared to standards using
matching nessler tubes - Standards prepared with solution containing chloroplatinate
and cobaltous chlorid
What is the standard unit for color? - ANS One unit= color resulting from 1 mg of
platinum/L
What is 2-color reporting? - ANS True and Apparent
Define True color - ANS Color from suspended solids, determine using sample treated
to remove turbidity
What is Apparent Color? - ANS Color from both dissolved and suspended solids
What is Conductivity? - ANS H2O capability to pass electrical flow
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Lectjoe. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $19.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
77254 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now