beccahmaarie
12.11.2019 •
Chemistry
Which of the following is a pure substance
a. chocolate
b. orange juice
c. seawater
d. hydrogen peroxide
Solved
Show answers
More tips
- H Health and Medicine Discover the Hidden Principles and Real Results of the Japanese Diet...
- C Computers and Internet Google Search Tips and Tricks: Everything You Need to Know...
- F Food and Cooking Experts Name Top 5 Healthiest Teas...
- F Food and Cooking From Latte to Espresso: Which Coffee Drink is the Most Popular on Earth?...
- F Food and Cooking How many stages of coffee roasting are there?...
- C Computers and Internet Porn Banner: What It Is and How to Get Rid Of It?...
- G Goods and services How to Choose a Coffee Maker? The Ultimate Guide for Coffee Lovers...
- C Computers and Internet How to Teach Older Generations to Work with Computers?...
- P Philosophy Unidentified Flying Object - What is the Nature of this Phenomenon?...
- H Health and Medicine Boosting Immunity: A Complete Guide on How to Improve Your Body’s Natural Defenses...
Answers on questions: Chemistry
- E English In typical Greek dramas, the prologue is the opening scene that provides background information about the play and sets up its conflict. Which two excerpts from Antigone successfully...
- H History Which of the following developments occurred first in the red region of the map? O A. The Industrial Revolution O B. The scientific revolution O O C. The communist movement...
- B Business Eleven years ago, chad invested $9,000. six years ago, allison invested $12,000. today, both chad s and allison s investments are each worth $2,400. assume that both chad and...
- B Biology Frequency is a. the number of waves that pass a point in a given time b. the height of a wave c. the speed of a wave d. the length of a wave...
Ответ:
Ответ:
a. C. volumetric flask
b. B. Measure out x mL using a volumetric pipet
c. 168.75mL
d. B. Add the correct amount of stock solution then fill to the 250 mL mark with water.
Explanation:
The volumetric flask is mainly used in analytical chemistry to contain standard solutions or to prepare dilutions of a certain concentration of a reagent.The volumetric pipette is used to deliver a given volume with greater precision and accuracy.To make a dilution, the formula C1*V1 = C2*V2 is used where C is the concentration of the solution, in this case of molarity. V is the volume of the solution in ml and terms 1 and 2 correspond to the concentrated and diluted solutions respectively.