# Solving Hydrate Formula w/ Titration: Na2CO3.xH20

• Zoey Brown
In summary, to determine the formula of a hydrate, you can use titration to find the number of moles of the hydrate's compound, in this case sodium carbonate. From there, you can calculate the mass of the compound and use the formula weight to determine the number of moles of the compound. This value, along with the mass of the compound, can be used to find the formula of the hydrate.
Zoey Brown

## Homework Statement

The formula of a hydrate may be determined by titarion. If 2.316g of a hydrate of sodium carbonate is required to completely neutralize 38.49 mL of 0.4198 mol/L HCl,find the formula of the hydrate. The products will be NaCl, H20, and CO3

n=cv
m=mM

## The Attempt at a Solution

Na2CO3 . xH20 --> Solving for x
find moles of HCL
Use mole ratios

Last edited:
You are titrating (measuring) the amount of sodium carbonate in the sample. The rest would be water (the water of hydration).

so does the 2.316g not include the xh2o?

Zoey Brown said:
so does the 2.316g not include the xh2o?

It does. But the titration result tells you how many moles of Na2CO3 are present, regardless of how much hydration water it contains.

symbolipoint
so if I've found that there are 0.00807906 mol of Na2CO3, where would i go from there to find the formula of the hydrate?

What is the mass of the 0.008079 moles of the sodium carbonate?

symbolipoint
would it be 2.316 g

Na2CO3 + 2HCl -----------> 2NaCl + H2O

Formula weight for sodium carbonate is 105.999 grams per mole
Formula weight for hydrogen chloride is --- will not be needed

Zoey Brown said:
would it be 2.316 g

Don't guess - calculate.

## 1. What is a hydrate formula?

A hydrate formula is a chemical formula that represents a compound containing a specific number of water molecules. These water molecules are chemically bonded to the compound and are essential for its structure and properties.

## 2. How is the hydrate formula of Na2CO3.xH20 determined?

The hydrate formula of Na2CO3.xH20 can be determined through a process called titration. In this process, a known concentration of acid is added to a solution containing the hydrated form of Na2CO3. The amount of acid needed to neutralize the solution is measured and used to calculate the number of water molecules present in the compound.

## 3. What is the purpose of titration in solving the hydrate formula of Na2CO3.xH20?

Titration is a precise and accurate method for determining the concentration of a substance in a solution. In the case of solving the hydrate formula of Na2CO3.xH20, titration is used to measure the amount of acid needed to neutralize the solution and thus determine the number of water molecules present in the compound.

## 4. Can the hydrate formula of Na2CO3.xH20 be solved without titration?

Yes, the hydrate formula of Na2CO3.xH20 can also be solved using other methods such as gravimetric analysis or mass spectrometry. However, titration is often the preferred method due to its simplicity and accuracy.

## 5. What are the potential sources of error in solving the hydrate formula of Na2CO3.xH20 through titration?

The potential sources of error in titration include inaccurate measurement of reagents, presence of impurities in the sample, and human error in reading the volume of titrant added. It is important to follow proper laboratory techniques and perform multiple trials to minimize these sources of error.

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