Ch.9 Solutions

Timberlake - Chemistry: An Introduction to General, Organic, and Biological Chemistry 13th Edition

Timberlake13th EditionChemistry: An Introduction to General, Organic, and Biological ChemistryISBN: 9780134421353Non è quello che usi tu?Cambia libro di testo

Timberlake 13th Edition

Ch.9 Solutions

Problema 113c

Capitolo 9, Problema 113c

In a laboratory experiment, a 10.0-mL sample of NaCl solution is poured into an evaporating dish with a mass of 24.10 g. The combined mass of the evaporating dish and NaCl solution is 36.15 g. After heating, the evaporating dish and dry NaCl have a combined mass of 25.50 g.
c. If water is added to 10.0 mL of the initial NaCl solution to give a final volume of 60.0 mL, what is the molarity of the diluted NaCl solution?

Guida verificata passo dopo passo

Step 1: Calculate the mass of the NaCl solution by subtracting the mass of the empty evaporating dish from the combined mass of the dish and solution. Use the formula:

m solution = m_{dish+solution} - m_{dish}

Step 2: Determine the mass of the NaCl solute by subtracting the mass of the empty evaporating dish from the combined mass of the dish and dry NaCl. Use the formula:

m solute = m_{dish+dryNaCl} - m_{dish}

Step 3: Calculate the mass percent of NaCl in the original solution using the formula:

Mass percent = \frac{m solute}{m} \times 100

Step 4: Use the mass of the NaCl solute and its molar mass (

58.44 g/mol

) to calculate the number of moles of NaCl in the original solution. Use the formula:

n NaCl = \frac{m}{solute}

Step 5: Calculate the molarity of the diluted NaCl solution by dividing the moles of NaCl by the final volume of the solution (60.0 mL, converted to liters). Use the formula:

M diluted = \frac{n}{NaCl}

, where

V solution

is in liters.

Risposta video verificata per un problema simile:

Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.

Durata del video:

Concetti chiave

Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.

Molarity

Molarity is a measure of concentration defined as the number of moles of solute per liter of solution. It is expressed in moles per liter (mol/L). To calculate molarity, you need to know the amount of solute in moles and the total volume of the solution in liters. This concept is crucial for understanding how the concentration of a solution changes when it is diluted.

Video consigliato:

Percorso guidato

00:53

Molarity

Dilution

Dilution is the process of reducing the concentration of a solute in a solution, typically by adding more solvent. When a solution is diluted, the number of moles of solute remains constant, but the volume increases, leading to a lower molarity. The dilution equation, M1V1 = M2V2, relates the initial and final molarity and volume, which is essential for solving dilution problems.

Video consigliato:

Percorso guidato

00:58

Dilutions

Volume Conversion

Volume conversion is the process of converting between different units of volume, such as milliliters (mL) and liters (L). In the context of molarity, it is important to express the total volume of the solution in liters since molarity is defined in terms of liters. Understanding how to convert between these units is necessary for accurately calculating the molarity of a solution after dilution.

Video consigliato:

Percorso guidato

02:10

Conversion Factors (Simplified) Concept 2

Pratica correlata

Domanda del libro di testo

In a laboratory experiment, a 10.0-mL sample of NaCl solution is poured into an evaporating dish with a mass of 24.10 g. The combined mass of the evaporating dish and NaCl solution is 36.15 g. After heating, the evaporating dish and dry NaCl have a combined mass of 25.50 g.

b. What is the molarity (M) of the NaCl solution?

2269

views

Domanda del libro di testo

An 80-proof brandy is a 40.% (v/v) ethanol solution. The "proof" is twice the percent concentration of alcohol in the beverage. How many milliliters of alcohol are present in 750 mL of brandy?

1323

views

Domanda del libro di testo

A solution is prepared with 70.0 g of HNO₃ and 130.0 g of H₂O. The HNO₃ solution has a density of 1.21 g/mL. (9.4)

d. What is the molarity (M) of the solution?

2646

views

Domanda del libro di testo

A solution is prepared with 70.0 g of HNO₃ and 130.0 g of H₂O. The HNO₃ solution has a density of 1.21 g/mL.

b. What is the total volume, in milliliters, of the solution?

1574

views