Debbie was doing a science lab, and she was instructed to decide whether a piece of plastic would float or sink without actually
2 answers:
Answer:
Debbie can take the following step
1. Find the mass of the substance in kilograms by measuring on a chemical balance and record
2. Fine the volume of the plastic(m^3). if it is a cylindrical plastic, volume will be area multiplied by height()
3. Density of a substance is the ratio of the mass of a substance to its volume.Find its density and record
4. Compare the density of the substance to that of water which is 1000kg/m^3.
5. If it is greater than that of water then it will sink, if it is less than that of water it will float
Explanation:
Debbie can take the following step
1. Find the mass of the substance in kilograms by measuring on a chemical balance and record
2. Fine the volume of the plastic(m^3). if it is a cylindrical plastic, volume will be area multiplied by height()
3. Density of a substance is the ratio of the mass of a substance to its volume.Find its density and record
4. Compare the density of the substance to that of water which is 1000kg/m^3.
5. If it is greater than that of water then it will sink, if it is less than that of water it will float
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Answer:
Final pH: 9.49.
Round to two decimal places as in the question: 9.5.
Explanation:
The conjugate of B is a cation that contains one more proton than B. The conjugate of B is an acid. As a result, B is a weak base.
What's the pKb of base B?
Consider the Henderson-Hasselbalch equation for buffers of a weak base and its conjugate acid ion.
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What's the new salt-to-base ratio?
The 0.005 mol of HCl will convert 0.005 mol of base B to its conjugate acid ion BH⁺.
Initial:
;
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After adding the HCl:
;
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Assume that the volume is still 0.5 L:
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What's will be the pH of the solution?
Apply the Henderson-Hasselbalch equation again:
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The final pH is slightly smaller than the initial pH. That's expected due to the hydrochloric acid. However, the change is small due to the nature of buffer solutions: adding a small amount of acid or base won't significantly impact the pH of the solution.