1. how many grams of k₂cr₂o₇ can dissolve in 100 g of 50° water?
2. which compound can dissolve the most grams in 10° water?
3. what is the temperature if 75 g of pb(no₃)₂ will dissolve in 100 g of water?
4. which compound can dissolve 43 g in 100 g of 53° water?
5. one hundred grams of 20° water is saturated with kno₃. how many additional grams can be dissolved if the temperature is raised to 45°?

Question

Accepted Answer

### Question 1:
# Explanation:
## Step1: Locate the solubility curve for $K_2Cr_2O_7$ and find the value at $50^\circ C$ on the temperature axis.
From the solubility curve, at $50^\circ C$, the solubility of $K_2Cr_2O_7$ in 100 g of water is found by reading the y - value (grams of solute) corresponding to $x = 50^\circ C$ on the $K_2Cr_2O_7$ curve.
## Step2: Determine the solubility.
Looking at the curve, the solubility of $K_2Cr_2O_7$ at $50^\circ C$ in 100 g of water is approximately 25 g (this value is obtained from typical solubility curves for $K_2Cr_2O_7$; the exact value may vary slightly depending on the curve, but around 25 g is a common value).
# Answer:
Approximately 25 grams (the value may vary slightly depending on the exact solubility curve, but around 25 g is typical).

### Question 2:
# Explanation:
## Step1: Locate the solubility curves of all compounds at $10^\circ C$.
We look at the y - axis (grams of solute in 100 g of water) for each compound's curve at $x = 10^\circ C$.
## Step2: Compare the solubilities.
Compounds like $NaNO_3$ have a relatively high solubility at lower temperatures. By comparing the y - values of different compound curves at $10^\circ C$, we find that $NaNO_3$ has the highest solubility (the solubility of $NaNO_3$ at $10^\circ C$ is relatively higher than other compounds like $KNO_3$, $NaCl$, etc. at this temperature).
# Answer:
$NaNO_3$ (Sodium Nitrate)
# Brief Explanations:
To determine which compound dissolves the most in $10^\circ$ water, we analyze the solubility curves at $10^\circ C$. By comparing the amount of solute (in grams per 100 g of water) for each compound at $10^\circ C$, we find that $NaNO_3$ has the highest solubility among the given compounds at this temperature.
# Answer:
$NaNO_3$ (Sodium Nitrate)

### Question 3:
# Explanation:
## Step1: Locate the solubility curve for $Pb(NO_3)_2$.
We find the curve corresponding to $Pb(NO_3)_2$ on the solubility graph.
## Step2: Find the temperature corresponding to 75 g of $Pb(NO_3)_2$ in 100 g of water.
We move horizontally from $y = 75$ (grams of $Pb(NO_3)_2$) until we hit the $Pb(NO_3)_2$ solubility curve, then move down to the temperature axis ($x$ - axis). This gives us a temperature of approximately $60^\circ C$ (the exact value may vary slightly depending on the curve, but around $60^\circ C$ is typical for a solubility of 75 g of $Pb(NO_3)_2$ in 100 g of water).
# Answer:
Approximately $60^\circ C$ (the value may vary slightly depending on the exact solubility curve, but around $60^\circ C$ is typical).

### Question 4:
# Explanation:
## Step1: Locate the solubility value of 43 g at $53^\circ C$ on the y - axis.
We find the y - value of 43 g on the solubility graph.
## Step2: Find the compound whose curve passes through (or is closest to) the point $(53^\circ C, 43 g)$.
By looking at the solubility curves, the curve for $KCl$ (Potassium Chloride) at $53^\circ C$ has a solubility close to 43 g in 100 g of water (the solubility of $KCl$ at around $50 - 55^\circ C$ is approximately 43 g, which matches the given conditions).
# Answer:
$KCl$ (Potassium Chloride)

### Question 5:
# Explanation:
## Step1: Find the solubility of $KNO_3$ at $20^\circ C$.
From the solubility curve, the solubility of $KNO_3$ at $20^\circ C$ in 100 g of water is approximately 30 g (this is a typical value from solubility curves for $KNO_3$).
## Step2: Find the solubility of $KNO_3$ at $45^\circ C$.
From the solubility curve, the solubility of $KNO_3$ at $45^\circ C$ in 100 g of water is approximately 75 g (again, a typical value from solubility curves for $KNO_3$).
## Step3: Calculate the additional amount.
To find the additional amount of $KNO_3$ that can be dissolved, we subtract the solubility at $20^\circ C$ from the solubility at $45^\circ C$. So, $75 - 30=45$ g.
# Answer:
45 grams (the values of solubility at $20^\circ C$ (30 g) and $45^\circ C$ (75 g) are typical values from solubility curves for $KNO_3$; the result is obtained by subtracting the lower solubility from the higher one).

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QUESTION IMAGE

Question

Explanation:

Question 1:

Step1: Locate the solubility curve for \(K_2Cr_2O_7\) and find the value at \(50^\circ C\) on the temperature axis.

Step2: Determine the solubility.

Step1: Locate the solubility curves of all compounds at \(10^\circ C\).

Step2: Compare the solubilities.

Answer:

Question 2: