Phenolphthalein - Study guides, Class notes & Summaries
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OCR B Salters Chemistry exam 2023 with 100% correct answers
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History of the atom correct answersSolid sphere 
Johnson - Plum pudding (-ve electrons) 
Rutherford - fired alpha particles at thin gold sheet, a few were deflected backwards - tiny +ve nucleus, surrounded by cloud of -ve electrons 
Electrons in shells/ energy levels 
 
Percentage yield equation correct answersactual yield/theoretical yield x 100 
 
Making new concentrations equation correct answersvol to use = final conc/initial conc x vol required 
 
Acid-alkali titrations correct answersUse p...
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CWEA Lab Analyst III Certification Test | Questions with 100% Correct Answers | Verified | Latest Update 2024
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What does COLOR measure? - Amount of color units (CU) in a sample. Color caused by natural 
metallic ions (Fe & Mg) & industrial wastes. 
What is the test summary for COLOR? - Sample -> Tubes -> Compare to color standards over light 
source 
Which of the following techniques is used to isolate anionic surfactants (as MBAS) from the sample 
matrix? - Extraction 
In the cyanide determination, which one of the following is not an interference? - Halogenated 
aromatics 
Which of the following ...
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CHEMISTRY PRAXIS Practice Exam Questions And Answers (Updated And Verified)
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CHEMISTRY PRAXIS Practice Exam 
Questions And Answers (Updated And 
Verified) 
What is the negative log of 1 X10⁻⁷ - answer7 
When [H₃O⁺] = [OH⁻] the solution is acidic or basic or neutral - answerneutral 
The concentration of H₃O⁺ and OH⁻ in pure water at 25°C - answer1X10⁻⁷ 
Kw - answer1X10⁻¹⁴ 
pH + pOH = - answer14 
What is the concentration of Hydrogen ion when the pH is 2 - answer1X10⁻² 
Using the - log [H⁺] or - log [H₃O⁺] helps you find the - answerpH 
U...
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CWEA - Lab Analyst III CWEA Certification Test Q&S
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CWEA - Lab Analyst III CWEA Certification Test Q&S 
What does COLOR measure? - ANS-Amount of color units (CU) in a sample. Color caused by natural 
metallic ions (Fe & Mg) & industrial wastes. 
What is the test summary for COLOR? - ANS-Sample -> Tubes -> Compare to color standards over light 
source 
Which of the following techniques is used to isolate anionic surfactants (as MBAS) from the sample 
matrix? - ANS-Extraction 
In the cyanide determination, which one of the following is not...
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Pharm 121 laboratory Answer Sheets 2023/2024 (100%Verified) - Saint Louis University.
- Exam (elaborations) • 33 pages • 2024
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Pharm 121 laboratory Answer Sheets 2023/2024 (100%Verified) - Saint Louis University. 
Pharm 121 laboratory Answer Sheets. 
Activity 1.1. Identify the following apparatuses used in the chemistry laboratory. Write your answers on the space 
provided before each item. 
_____________________________ a. It is used to hold solids while they are being weighed or to cover a beaker. 
_____________________________ b. It is convenient for collecting a precipitate directly within the vessel in which 
it is...
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Chemistry 120 Test 4| 168 Questions| With Complete Solutions
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produces H+ in water correct answer: acid 
 
is named hydroiodic acid correct answer: acid 
 
is named magnesium hydroxide correct answer: base 
 
turn phenolphthalein pink correct answer: base 
 
conducts an electrical current correct answer: acid and base 
 
properties of acids correct answer: dissolve many metals, taste sour, turn litmus paper red 
 
properties of bases correct answer: taste bitter, turn litmus paper blue, feel slippery 
 
strong acids correct answer: HCl, HI, HNO3, H...
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CHEM 121 Lab Report 7: Acid Base Titrations FALL 2023 _Portage learning
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Title: Acid Base Titrations 
Purpose: In this lab, titration analyses will take place doing six different acid-base titrations. 
Titration is used to determine an unknown concentration of a substance. 
Procedure: 
Experiment 1: Weak acid, strong base 
Standardization titration was performed to determine the molarity of NaOH (Sodium Hydroxide) 
by titrating it against a weak acid, Potassium Hydrogen Phthalate. The acid is put in a beaker and 
phenolphthalein indicator and water is added. Titratio...
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Water Treatment 1- ADEQ Comprehensive Exam A score
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Water Treatment 1- ADEQ Comprehensive Exam A score 
 
What are the 3 responsibilities of any public water supplier? - 1. Provide water to meet all public demand 
2. Provide palatable and potable water 
3. Deliver water when needed 
 
What are 3 examples of public water usage? - 1. Domestic 
2. Industrial 
3. Agriculture 
 
What is GWUDI water system? - Ground Water Under Direct Influence of surface water 
 
What is the most common type of ion exchange water treatment process? - Water softeners 
...
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AS level OCR Chemistry Exam Questions And Answers (Verified And Updated)
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AS level OCR Chemistry Exam Questions 
And Answers (Verified And Updated) 
Isotopes - answerDifferent atomic forms of the same element. Atoms with the same number 
of protons but a different number of neutrons 
Relative atomic mass - answerThe mean mass of an atom of an element, compared to 1/12th 
of the mass of an atom of carbon-12 
Concentration= - answerNumber of moles ÷ Volume 
One mole - answer6.02×10^23 
Number of moles= - answermass ÷ molar mass 
r.t.p - answer25 ºC 
100 kPa (1 atm) ...
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Pharm 121 laboratory Answer Sheets 2023/2024 (100%Verified) - Saint Louis University.
- Exam (elaborations) • 33 pages • 2024
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Pharm 121 laboratory Answer Sheets 2023/2024 (100%Verified) - Saint Louis University. 
Pharm 121 laboratory Answer Sheets. 
Activity 1.1. Identify the following apparatuses used in the chemistry laboratory. Write your answers on the space 
provided before each item. 
_____________________________ a. It is used to hold solids while they are being weighed or to cover a beaker. 
_____________________________ b. It is convenient for collecting a precipitate directly within the vessel in which 
it is...
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