6 votes

Why is my battery of galvanic cells not enough to power a lamp rated for a lower voltage than the battery provides?

It is not a problem of voltage. It is a problem of current and power. Whatever its nominal voltage, your bulb has a power to be known in watts. If your $\ce{Zn/Cu}$ cells are not able to produce the ...
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5 votes
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How does CO2 'dissolve' in water (or blood)?

There are three relevant reactions here: Dissolution of gaseous carbon dioxide into aqueous solution: $\ce{CO2 (g) <=> CO2(aq)}$ Hydration of carbon dioxide to carbonic acid: $\ce{CO2 (aq) + ...
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5 votes

Details of what actually happens in cold sulfuric acid between 80 and 90%; what molecular changes cause the viscosity to skyrocket?

The composition where we see this rapid rise in viscosity corresponds to one of several sulfuric acid hydrates, specifically the monohydrate formally rendered as $\ce{H2SO4•H2O}$. As shown in this ...
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4 votes
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Purifying ferrous sulfate

You better make your turbid solution boil with some iron wires $\ce{Fe}$ and a bit of sulfuric acid. The turbidity observed in your solution is due to a mixture of two precipitates containing $\ce{Fe^{...
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2 votes

Why is my battery of galvanic cells not enough to power a lamp rated for a lower voltage than the battery provides?

Maurice points out at the critical problem and answers the old classical problem. Why can't a 12 V ordinary battery be used in a car when a "large" lead-acid batery also generates 12 V? Your ...
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