Question

Смесь из 2г мела и 3г сахара добавить 30мл воды и размешать смесь. Затем отфильтровали смесь и получили белое твёрдое вещество на фильтровальной бумаге. Определить массу твёрдого вещества оставшегося на фильтровальной бумаге после высушки

Answer 1

а) на фильтровальной бумаге остался мел

б) жидкость - сладкая вода, сироп

в) масса мела, оставшегося на фильтровальной бумаге 2 г

Answer 2

Calculation of the Mass of the Solid Substance

To determine the mass of the solid substance that remains on the filter paper after drying, we need to consider the initial mass of the mixture and the percentage of the solid substance in the mixture.

Given: - 2 grams of chalk (mela) - 3 grams of sugar - 30 milliliters of water

To find the mass of the solid substance, we need to determine the percentage of the solid substance in the mixture. Let's calculate it step by step:

Step 1: Calculate the total mass of the mixture. The total mass of the mixture is the sum of the masses of chalk and sugar: Total mass of the mixture = mass of chalk + mass of sugar = 2 grams + 3 grams = 5 grams.

Step 2: Calculate the percentage of the solid substance in the mixture. The percentage of the solid substance in the mixture can be calculated using the following formula: Percentage of solid substance = (mass of solid substance / total mass of the mixture) * 100.

In this case, the solid substance is the chalk (mela). Let's calculate the percentage of chalk in the mixture: Percentage of chalk = (2 grams / 5 grams) * 100 = 40%.

Step 3: Calculate the mass of the solid substance remaining on the filter paper after drying. To determine the mass of the solid substance remaining on the filter paper, we need to consider the percentage of the solid substance in the mixture and the total mass of the mixture.

Since the solid substance is white and remains on the filter paper after filtration, we can assume that the solid substance is chalk (mela). Therefore, the mass of the solid substance remaining on the filter paper after drying can be calculated as follows: Mass of solid substance remaining = (Percentage of chalk / 100) * Total mass of the mixture.

Substituting the values: Mass of solid substance remaining = (40 / 100) * 5 grams = 2 grams.

Therefore, the mass of the solid substance remaining on the filter paper after drying is 2 grams.

Please note that the accuracy of this calculation depends on the accuracy of the given information and the assumption that the solid substance is chalk (mela).