Platinium salt of an organic base contains 32.5% platinium. Hence, equivalent weight of the base is?

To find the equivalent weight of the organic base from the given information about the platinum salt, we can use the concept of equivalent weight in relation to the percentage composition of platinum in the compound. Let's break this down step by step.

Understanding the Composition

The platinum salt contains 32.5% platinum by weight. This means that in 100 grams of the salt, there are 32.5 grams of platinum. The remaining mass will be attributed to the organic base and any other components in the salt.

Calculating the Molar Mass of Platinum

The atomic mass of platinum (Pt) is approximately 195 g/mol. This is essential for calculating the equivalent weight of the organic base.

Setting Up the Calculation

To find the equivalent weight of the base, we can use the formula:

• Equivalent Weight = Molar Mass / n

Here, "n" represents the number of moles of the base that can react with one mole of platinum. In many cases, for organic bases, n is often 1, but we will confirm this based on the composition.

Finding the Mass of the Organic Base

Since we know that 32.5 grams of platinum is present in 100 grams of the salt, we can deduce the mass of the organic base:

• Mass of organic base = Total mass of salt - Mass of platinum
• Mass of organic base = 100 g - 32.5 g = 67.5 g

Calculating the Equivalent Weight

Now, we can find the equivalent weight of the organic base. Since we have 32.5 grams of platinum, we can relate this to the organic base. The equivalent weight of the base can be calculated as follows:

• Equivalent weight of base = (Mass of base) / (Mass of platinum / Molar mass of platinum)
• Equivalent weight of base = (67.5 g) / (32.5 g / 195 g/mol)

Performing the Calculation

Now, let’s calculate the equivalent weight:

• Equivalent weight of base = 67.5 g / (32.5 g / 195 g/mol)
• Equivalent weight of base = 67.5 g / 0.16667 mol
• Equivalent weight of base ≈ 405 g/mol

Final Thoughts

The equivalent weight of the organic base is approximately 405 g/mol. This value indicates how much of the base would react with a mole of platinum in the salt. Understanding these calculations is crucial in fields such as analytical chemistry and materials science, where precise measurements and reactions are fundamental.