General Chemistry Answers

Double Indicator Titration

A groundwater sample was analyzed for its total alkalinity (assume that the alkaline constituents come from Na2CO3, NaHCO3 and NaOH, either alone or a permissible combination). For the analysis, a standardized 0.101M HCl solution was used.

Suppose a 30.0-ml sample required 13.2 ml of the titrant to reach phenolphthalein end point. Another 20.0 ml of the same water sample was titrated using methyl orange indicator and used 24.7 ml of the same titrant.

a. Determine the alkaline components of the sample

b. What are the molar concentrations of each component?

c. If the analyst did not boil the distilled water used to standardize the titrant in the problem, what will be the effect on the percentages of each component? Why?

If the temperature is decreased to 5 °C, what is the volume of the sample if the pressure is increased to 96.0 kPa?

An experiment was carried out to determine the mass of Sodium oxide in a solution sample. The sample was dissolved in water to make 200 cm³ of Sodium hydroxide. This solution required 500 cm³of Sulphuric acid to just neutralize it. The concentration of Sulphuric acid was 0.1mol/dm³ (0.1M)

What mass of Thallium has the same number of atoms as 65.2 g of Potassium?

What is the mass in grams of a single atom of thorium?

65.0g of aluminum reacted with 35.0g of barium oxide to produce aluminum oxide and barium.id 84.0 g of aluminum oxide is produced how much barium is produced

in order to find the best method to boil water,one litre of water is put in a pot to heat on a stove and one litre is boiled in a kettle. the time to reach boiling point is 100 degrees celsius is recorded. provide suitable hypothesis?

 III.           Given

You are an elected Sangguniang Kabataan (SK) Charmain of your barangay. You and other SK chairmen planned to help the SHS students of your city using a “Tulong-Aral-Program” in order to make them be more involved and in line with their studies. You and your team randomly selected a topic to plan and discuss, your topic is The Concept of Mole you plan to discuss using an infographic material.

You need to present your infographic material and your discussion to the coordinator of the program to be able to start your program.

 IV.           Requirement:

Create an infographic material about the concept of moles, Avogadro’s number, Amedeo Avogadro, Mole and Mass relationship, etc.  The infographic must include the following parts: (1) visuals, (2) descriptions, (3) a document showing your discussion plan for the topic.

Create an infographic material about the concept of moles, Avogadro’s number, Amedeo Avogadro, Mole and Mass relationship, etc. The infographic must include the following parts: (1) visuals, (2) descriptions, (3) a document showing your discussion plan for the topic. 

1. What is the mass in grams of a single atom of Thorium? 
2. What mass of Thallium has the same number of atoms as 65.2 g of Potassium?